-21=-3(x-5)

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


Simplifying
-21 = -3(x + -5)

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

Solving
-21 = 15 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
-21 + 3x = 15 + -3x + 3x

Combine like terms: -3x + 3x = 0
-21 + 3x = 15 + 0
-21 + 3x = 15

Add '21' to each side of the equation.
-21 + 21 + 3x = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 3x = 15 + 21
3x = 15 + 21

Combine like terms: 15 + 21 = 36
3x = 36

Divide each side by '3'.
x = 12

Simplifying
x = 12

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