-3(x+9)=x-21

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Solution for -3(x+9)=x-21 equation:


Simplifying
-3(x + 9) = x + -21

Reorder the terms:
-3(9 + x) = x + -21
(9 * -3 + x * -3) = x + -21
(-27 + -3x) = x + -21

Reorder the terms:
-27 + -3x = -21 + x

Solving
-27 + -3x = -21 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
-27 + -3x + -1x = -21 + x + -1x

Combine like terms: -3x + -1x = -4x
-27 + -4x = -21 + x + -1x

Combine like terms: x + -1x = 0
-27 + -4x = -21 + 0
-27 + -4x = -21

Add '27' to each side of the equation.
-27 + 27 + -4x = -21 + 27

Combine like terms: -27 + 27 = 0
0 + -4x = -21 + 27
-4x = -21 + 27

Combine like terms: -21 + 27 = 6
-4x = 6

Divide each side by '-4'.
x = -1.5

Simplifying
x = -1.5

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