3x+21=12x-78

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Solution for 3x+21=12x-78 equation:


Simplifying
3x + 21 = 12x + -78

Reorder the terms:
21 + 3x = 12x + -78

Reorder the terms:
21 + 3x = -78 + 12x

Solving
21 + 3x = -78 + 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 + 3x + -12x = -78 + 12x + -12x

Combine like terms: 3x + -12x = -9x
21 + -9x = -78 + 12x + -12x

Combine like terms: 12x + -12x = 0
21 + -9x = -78 + 0
21 + -9x = -78

Add '-21' to each side of the equation.
21 + -21 + -9x = -78 + -21

Combine like terms: 21 + -21 = 0
0 + -9x = -78 + -21
-9x = -78 + -21

Combine like terms: -78 + -21 = -99
-9x = -99

Divide each side by '-9'.
x = 11

Simplifying
x = 11

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