3(x+2)=12x-21

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Solution for 3(x+2)=12x-21 equation:


Simplifying
3(x + 2) = 12x + -21

Reorder the terms:
3(2 + x) = 12x + -21
(2 * 3 + x * 3) = 12x + -21
(6 + 3x) = 12x + -21

Reorder the terms:
6 + 3x = -21 + 12x

Solving
6 + 3x = -21 + 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.
6 + 3x + -12x = -21 + 12x + -12x

Combine like terms: 3x + -12x = -9x
6 + -9x = -21 + 12x + -12x

Combine like terms: 12x + -12x = 0
6 + -9x = -21 + 0
6 + -9x = -21

Add '-6' to each side of the equation.
6 + -6 + -9x = -21 + -6

Combine like terms: 6 + -6 = 0
0 + -9x = -21 + -6
-9x = -21 + -6

Combine like terms: -21 + -6 = -27
-9x = -27

Divide each side by '-9'.
x = 3

Simplifying
x = 3

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