9x+21=12x+42

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Solution for 9x+21=12x+42 equation:


Simplifying
9x + 21 = 12x + 42

Reorder the terms:
21 + 9x = 12x + 42

Reorder the terms:
21 + 9x = 42 + 12x

Solving
21 + 9x = 42 + 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 + 9x + -12x = 42 + 12x + -12x

Combine like terms: 9x + -12x = -3x
21 + -3x = 42 + 12x + -12x

Combine like terms: 12x + -12x = 0
21 + -3x = 42 + 0
21 + -3x = 42

Add '-21' to each side of the equation.
21 + -21 + -3x = 42 + -21

Combine like terms: 21 + -21 = 0
0 + -3x = 42 + -21
-3x = 42 + -21

Combine like terms: 42 + -21 = 21
-3x = 21

Divide each side by '-3'.
x = -7

Simplifying
x = -7

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