-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

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

Solving
-21 + 3x = 42

Solving for variable 'x'.

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

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 = 63
3x = 63

Divide each side by '3'.
x = 21

Simplifying
x = 21

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