21=-4(3x-1)-18

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Solution for 21=-4(3x-1)-18 equation:


Simplifying
21 = -4(3x + -1) + -18

Reorder the terms:
21 = -4(-1 + 3x) + -18
21 = (-1 * -4 + 3x * -4) + -18
21 = (4 + -12x) + -18

Reorder the terms:
21 = 4 + -18 + -12x

Combine like terms: 4 + -18 = -14
21 = -14 + -12x

Solving
21 = -14 + -12x

Solving for variable 'x'.

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

Add '12x' to each side of the equation.
21 + 12x = -14 + -12x + 12x

Combine like terms: -12x + 12x = 0
21 + 12x = -14 + 0
21 + 12x = -14

Add '-21' to each side of the equation.
21 + -21 + 12x = -14 + -21

Combine like terms: 21 + -21 = 0
0 + 12x = -14 + -21
12x = -14 + -21

Combine like terms: -14 + -21 = -35
12x = -35

Divide each side by '12'.
x = -2.916666667

Simplifying
x = -2.916666667

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