21=12-3x

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Solution for 21=12-3x equation: 


Simplifying
21 = 12 + -3x

Solving
21 = 12 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
21 + 3x = 12 + -3x + 3x

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

Add '-21' to each side of the equation.
21 + -21 + 3x = 12 + -21

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

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

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

Simplifying
x = -3

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