3(5-4x-4x)+9(2x+8)=21

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Solution for 3(5-4x-4x)+9(2x+8)=21 equation:


Simplifying
3(5 + -4x + -4x) + 9(2x + 8) = 21

Combine like terms: -4x + -4x = -8x
3(5 + -8x) + 9(2x + 8) = 21
(5 * 3 + -8x * 3) + 9(2x + 8) = 21
(15 + -24x) + 9(2x + 8) = 21

Reorder the terms:
15 + -24x + 9(8 + 2x) = 21
15 + -24x + (8 * 9 + 2x * 9) = 21
15 + -24x + (72 + 18x) = 21

Reorder the terms:
15 + 72 + -24x + 18x = 21

Combine like terms: 15 + 72 = 87
87 + -24x + 18x = 21

Combine like terms: -24x + 18x = -6x
87 + -6x = 21

Solving
87 + -6x = 21

Solving for variable 'x'.

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

Add '-87' to each side of the equation.
87 + -87 + -6x = 21 + -87

Combine like terms: 87 + -87 = 0
0 + -6x = 21 + -87
-6x = 21 + -87

Combine like terms: 21 + -87 = -66
-6x = -66

Divide each side by '-6'.
x = 11

Simplifying
x = 11

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