3x+21=12x-51

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Solution for 3x+21=12x-51 equation:


Simplifying
3x + 21 = 12x + -51

Reorder the terms:
21 + 3x = 12x + -51

Reorder the terms:
21 + 3x = -51 + 12x

Solving
21 + 3x = -51 + 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 = -51 + 12x + -12x

Combine like terms: 3x + -12x = -9x
21 + -9x = -51 + 12x + -12x

Combine like terms: 12x + -12x = 0
21 + -9x = -51 + 0
21 + -9x = -51

Add '-21' to each side of the equation.
21 + -21 + -9x = -51 + -21

Combine like terms: 21 + -21 = 0
0 + -9x = -51 + -21
-9x = -51 + -21

Combine like terms: -51 + -21 = -72
-9x = -72

Divide each side by '-9'.
x = 8

Simplifying
x = 8

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