(3x-7)(7x+15)=0

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Solution for (3x-7)(7x+15)=0 equation: 


Simplifying
(3x + -7)(7x + 15) = 0

Reorder the terms:
(-7 + 3x)(7x + 15) = 0

Reorder the terms:
(-7 + 3x)(15 + 7x) = 0

Multiply (-7 + 3x) * (15 + 7x)
(-7(15 + 7x) + 3x * (15 + 7x)) = 0
((15 * -7 + 7x * -7) + 3x * (15 + 7x)) = 0
((-105 + -49x) + 3x * (15 + 7x)) = 0
(-105 + -49x + (15 * 3x + 7x * 3x)) = 0
(-105 + -49x + (45x + 21x2)) = 0

Combine like terms: -49x + 45x = -4x
(-105 + -4x + 21x2) = 0

Solving
-105 + -4x + 21x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-15 + -7x)(7 + -3x) = 0


Subproblem 1
Set the factor '(-15 + -7x)' equal to zero and attempt to solve:

Simplifying
-15 + -7x = 0

Solving
-15 + -7x = 0

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

Add '15' to each side of the equation.
-15 + 15 + -7x = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -7x = 0 + 15
-7x = 0 + 15

Combine like terms: 0 + 15 = 15
-7x = 15

Divide each side by '-7'.
x = -2.142857143

Simplifying
x = -2.142857143

Subproblem 2
Set the factor '(7 + -3x)' equal to zero and attempt to solve:

Simplifying
7 + -3x = 0

Solving
7 + -3x = 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 + -3x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -3x = 0 + -7
-3x = 0 + -7

Combine like terms: 0 + -7 = -7
-3x = -7

Divide each side by '-3'.
x = 2.333333333

Simplifying
x = 2.333333333
Solution
x = {-2.142857143, 2.333333333}

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