-9+x=-21

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Solution for -9+x=-21 equation: 


Simplifying
-9 + x = -21

Solving
-9 + x = -21

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + x = -21 + 9

Combine like terms: -9 + 9 = 0
0 + x = -21 + 9
x = -21 + 9

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

Simplifying
x = -12

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