x-(-9)=-21

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Solution for x-(-9)=-21 equation: 


Simplifying
x + -1(-9) = -21

Multiply -1 * -9
x + 9 = -21

Reorder the terms:
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 = -30
x = -30

Simplifying
x = -30

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