3n-9=7n-15

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Solution for 3n-9=7n-15 equation:


Simplifying
3n + -9 = 7n + -15

Reorder the terms:
-9 + 3n = 7n + -15

Reorder the terms:
-9 + 3n = -15 + 7n

Solving
-9 + 3n = -15 + 7n

Solving for variable 'n'.

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

Add '-7n' to each side of the equation.
-9 + 3n + -7n = -15 + 7n + -7n

Combine like terms: 3n + -7n = -4n
-9 + -4n = -15 + 7n + -7n

Combine like terms: 7n + -7n = 0
-9 + -4n = -15 + 0
-9 + -4n = -15

Add '9' to each side of the equation.
-9 + 9 + -4n = -15 + 9

Combine like terms: -9 + 9 = 0
0 + -4n = -15 + 9
-4n = -15 + 9

Combine like terms: -15 + 9 = -6
-4n = -6

Divide each side by '-4'.
n = 1.5

Simplifying
n = 1.5

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