x-(-7)=-21

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Solution for x-(-7)=-21 equation: 


Simplifying
x + -1(-7) = -21

Multiply -1 * -7
x + 7 = -21

Reorder the terms:
7 + x = -21

Solving
7 + x = -21

Solving for variable 'x'.

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

Add '-7' to each side of the equation.
7 + -7 + x = -21 + -7

Combine like terms: 7 + -7 = 0
0 + x = -21 + -7
x = -21 + -7

Combine like terms: -21 + -7 = -28
x = -28

Simplifying
x = -28

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