ln(9x-7)+ln(x+7)=ln(x+15)

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Solution for ln(9x-7)+ln(x+7)=ln(x+15) equation:


Simplifying
ln(9x + -7) + ln(x + 7) = ln(x + 15)

Reorder the terms:
ln(-7 + 9x) + ln(x + 7) = ln(x + 15)
(-7 * ln + 9x * ln) + ln(x + 7) = ln(x + 15)
(-7ln + 9lnx) + ln(x + 7) = ln(x + 15)

Reorder the terms:
-7ln + 9lnx + ln(7 + x) = ln(x + 15)
-7ln + 9lnx + (7 * ln + x * ln) = ln(x + 15)
-7ln + 9lnx + (7ln + lnx) = ln(x + 15)

Reorder the terms:
-7ln + 7ln + 9lnx + lnx = ln(x + 15)

Combine like terms: -7ln + 7ln = 0
0 + 9lnx + lnx = ln(x + 15)
9lnx + lnx = ln(x + 15)

Combine like terms: 9lnx + lnx = 10lnx
10lnx = ln(x + 15)

Reorder the terms:
10lnx = ln(15 + x)
10lnx = (15 * ln + x * ln)
10lnx = (15ln + lnx)

Solving
10lnx = 15ln + lnx

Solving for variable 'l'.

Move all terms containing l to the left, all other terms to the right.

Add '-15ln' to each side of the equation.
-15ln + 10lnx = 15ln + -15ln + lnx

Combine like terms: 15ln + -15ln = 0
-15ln + 10lnx = 0 + lnx
-15ln + 10lnx = lnx

Add '-1lnx' to each side of the equation.
-15ln + 10lnx + -1lnx = lnx + -1lnx

Combine like terms: 10lnx + -1lnx = 9lnx
-15ln + 9lnx = lnx + -1lnx

Combine like terms: lnx + -1lnx = 0
-15ln + 9lnx = 0

Factor out the Greatest Common Factor (GCF), '3ln'.
3ln(-5 + 3x) = 0

Ignore the factor 3.

Subproblem 1

Set the factor 'ln' equal to zero and attempt to solve: Simplifying ln = 0 Solving ln = 0 Move all terms containing l to the left, all other terms to the right. Simplifying ln = 0 The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined.

Subproblem 2

Set the factor '(-5 + 3x)' equal to zero and attempt to solve: Simplifying -5 + 3x = 0 Solving -5 + 3x = 0 Move all terms containing l to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 3x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + 3x = 0 + 5 3x = 0 + 5 Combine like terms: 0 + 5 = 5 3x = 5 Add '-3x' to each side of the equation. 3x + -3x = 5 + -3x Combine like terms: 3x + -3x = 0 0 = 5 + -3x Simplifying 0 = 5 + -3x The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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