(3x-7)(7x+9)=0

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Solution for (3x-7)(7x+9)=0 equation: 


Simplifying
(3x + -7)(7x + 9) = 0

Reorder the terms:
(-7 + 3x)(7x + 9) = 0

Reorder the terms:
(-7 + 3x)(9 + 7x) = 0

Multiply (-7 + 3x) * (9 + 7x)
(-7(9 + 7x) + 3x * (9 + 7x)) = 0
((9 * -7 + 7x * -7) + 3x * (9 + 7x)) = 0
((-63 + -49x) + 3x * (9 + 7x)) = 0
(-63 + -49x + (9 * 3x + 7x * 3x)) = 0
(-63 + -49x + (27x + 21x2)) = 0

Combine like terms: -49x + 27x = -22x
(-63 + -22x + 21x2) = 0

Solving
-63 + -22x + 21x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -7x)(7 + -3x) = 0


Subproblem 1
Set the factor '(-9 + -7x)' equal to zero and attempt to solve:

Simplifying
-9 + -7x = 0

Solving
-9 + -7x = 0

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

Add '9' to each side of the equation.
-9 + 9 + -7x = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -7x = 0 + 9
-7x = 0 + 9

Combine like terms: 0 + 9 = 9
-7x = 9

Divide each side by '-7'.
x = -1.285714286

Simplifying
x = -1.285714286

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 = {-1.285714286, 2.333333333}

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