(7-x)(3x+4)=0

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Solution for (7-x)(3x+4)=0 equation: 


Simplifying
(7 + -1x)(3x + 4) = 0

Reorder the terms:
(7 + -1x)(4 + 3x) = 0

Multiply (7 + -1x) * (4 + 3x)
(7(4 + 3x) + -1x * (4 + 3x)) = 0
((4 * 7 + 3x * 7) + -1x * (4 + 3x)) = 0
((28 + 21x) + -1x * (4 + 3x)) = 0
(28 + 21x + (4 * -1x + 3x * -1x)) = 0
(28 + 21x + (-4x + -3x2)) = 0

Combine like terms: 21x + -4x = 17x
(28 + 17x + -3x2) = 0

Solving
28 + 17x + -3x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(7 + -1x)(4 + 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 '(4 + 3x)' equal to zero and attempt to solve:

Simplifying
4 + 3x = 0

Solving
4 + 3x = 0

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

Add '-4' to each side of the equation.
4 + -4 + 3x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 3x = 0 + -4
3x = 0 + -4

Combine like terms: 0 + -4 = -4
3x = -4

Divide each side by '3'.
x = -1.333333333

Simplifying
x = -1.333333333
Solution
x = {7, -1.333333333}

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