-3(1-2x)-3(5x-5)=21

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Solution for -3(1-2x)-3(5x-5)=21 equation: 


Simplifying
-3(1 + -2x) + -3(5x + -5) = 21
(1 * -3 + -2x * -3) + -3(5x + -5) = 21
(-3 + 6x) + -3(5x + -5) = 21

Reorder the terms:
-3 + 6x + -3(-5 + 5x) = 21
-3 + 6x + (-5 * -3 + 5x * -3) = 21
-3 + 6x + (15 + -15x) = 21

Reorder the terms:
-3 + 15 + 6x + -15x = 21

Combine like terms: -3 + 15 = 12
12 + 6x + -15x = 21

Combine like terms: 6x + -15x = -9x
12 + -9x = 21

Solving
12 + -9x = 21

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + -9x = 21 + -12

Combine like terms: 12 + -12 = 0
0 + -9x = 21 + -12
-9x = 21 + -12

Combine like terms: 21 + -12 = 9
-9x = 9

Divide each side by '-9'.
x = -1

Simplifying
x = -1

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