(x+7)(3x-20)=0

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Solution for (x+7)(3x-20)=0 equation: 


Simplifying
(x + 7)(3x + -20) = 0

Reorder the terms:
(7 + x)(3x + -20) = 0

Reorder the terms:
(7 + x)(-20 + 3x) = 0

Multiply (7 + x) * (-20 + 3x)
(7(-20 + 3x) + x(-20 + 3x)) = 0
((-20 * 7 + 3x * 7) + x(-20 + 3x)) = 0
((-140 + 21x) + x(-20 + 3x)) = 0
(-140 + 21x + (-20 * x + 3x * x)) = 0
(-140 + 21x + (-20x + 3x2)) = 0

Combine like terms: 21x + -20x = 1x
(-140 + 1x + 3x2) = 0

Solving
-140 + 1x + 3x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-7 + -1x)(20 + -3x) = 0


Subproblem 1
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

Subproblem 2
Set the factor '(20 + -3x)' equal to zero and attempt to solve:

Simplifying
20 + -3x = 0

Solving
20 + -3x = 0

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

Add '-20' to each side of the equation.
20 + -20 + -3x = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -3x = 0 + -20
-3x = 0 + -20

Combine like terms: 0 + -20 = -20
-3x = -20

Divide each side by '-3'.
x = 6.666666667

Simplifying
x = 6.666666667
Solution
x = {-7, 6.666666667}

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