3(5x+1)(x-7)=0

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Solution for 3(5x+1)(x-7)=0 equation: 


Simplifying
3(5x + 1)(x + -7) = 0

Reorder the terms:
3(1 + 5x)(x + -7) = 0

Reorder the terms:
3(1 + 5x)(-7 + x) = 0

Multiply (1 + 5x) * (-7 + x)
3(1(-7 + x) + 5x * (-7 + x)) = 0
3((-7 * 1 + x * 1) + 5x * (-7 + x)) = 0
3((-7 + 1x) + 5x * (-7 + x)) = 0
3(-7 + 1x + (-7 * 5x + x * 5x)) = 0
3(-7 + 1x + (-35x + 5x2)) = 0

Combine like terms: 1x + -35x = -34x
3(-7 + -34x + 5x2) = 0
(-7 * 3 + -34x * 3 + 5x2 * 3) = 0
(-21 + -102x + 15x2) = 0

Solving
-21 + -102x + 15x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-7 + -34x + 5x2) = 0

Factor a trinomial.
3((-1 + -5x)(7 + -1x)) = 0

Ignore the factor 3.

Subproblem 1
Set the factor '(-1 + -5x)' equal to zero and attempt to solve:

Simplifying
-1 + -5x = 0

Solving
-1 + -5x = 0

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

Add '1' to each side of the equation.
-1 + 1 + -5x = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -5x = 0 + 1
-5x = 0 + 1

Combine like terms: 0 + 1 = 1
-5x = 1

Divide each side by '-5'.
x = -0.2

Simplifying
x = -0.2

Subproblem 2
Set the factor '(7 + -1x)' equal to zero and attempt to solve:

Simplifying
7 + -1x = 0

Solving
7 + -1x = 0

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

Add '-7' to each side of the equation.
7 + -7 + -1x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -1x = 0 + -7
-1x = 0 + -7

Combine like terms: 0 + -7 = -7
-1x = -7

Divide each side by '-1'.
x = 7

Simplifying
x = 7
Solution
x = {-0.2, 7}

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