21-12=x+2

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Solution for 21-12=x+2 equation:


Simplifying
21 + -12 = x + 2

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

Reorder the terms:
9 = 2 + x

Solving
9 = 2 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
9 + -1x = 2 + x + -1x

Combine like terms: x + -1x = 0
9 + -1x = 2 + 0
9 + -1x = 2

Add '-9' to each side of the equation.
9 + -9 + -1x = 2 + -9

Combine like terms: 9 + -9 = 0
0 + -1x = 2 + -9
-1x = 2 + -9

Combine like terms: 2 + -9 = -7
-1x = -7

Divide each side by '-1'.
x = 7

Simplifying
x = 7

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