21-2x=12

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Solution for 21-2x=12 equation: 


Simplifying
21 + -2x = 12

Solving
21 + -2x = 12

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 + -2x = 12 + -21

Combine like terms: 21 + -21 = 0
0 + -2x = 12 + -21
-2x = 12 + -21

Combine like terms: 12 + -21 = -9
-2x = -9

Divide each side by '-2'.
x = 4.5

Simplifying
x = 4.5

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