-21=3(x-4)

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Solution for -21=3(x-4) equation:


Simplifying
-21 = 3(x + -4)

Reorder the terms:
-21 = 3(-4 + x)
-21 = (-4 * 3 + x * 3)
-21 = (-12 + 3x)

Solving
-21 = -12 + 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 = -12 + 3x + -3x

Combine like terms: 3x + -3x = 0
-21 + -3x = -12 + 0
-21 + -3x = -12

Add '21' to each side of the equation.
-21 + 21 + -3x = -12 + 21

Combine like terms: -21 + 21 = 0
0 + -3x = -12 + 21
-3x = -12 + 21

Combine like terms: -12 + 21 = 9
-3x = 9

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

Simplifying
x = -3

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