21+2x=-9+12

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Solution for 21+2x=-9+12 equation: 


Simplifying
21 + 2x = -9 + 12

Combine like terms: -9 + 12 = 3
21 + 2x = 3

Solving
21 + 2x = 3

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 = 3 + -21

Combine like terms: 21 + -21 = 0
0 + 2x = 3 + -21
2x = 3 + -21

Combine like terms: 3 + -21 = -18
2x = -18

Divide each side by '2'.
x = -9

Simplifying
x = -9

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