x-(-21)=63

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Solution for x-(-21)=63 equation: 


Simplifying
x + -1(-21) = 63

Multiply -1 * -21
x + 21 = 63

Reorder the terms:
21 + x = 63

Solving
21 + x = 63

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 + x = 63 + -21

Combine like terms: 21 + -21 = 0
0 + x = 63 + -21
x = 63 + -21

Combine like terms: 63 + -21 = 42
x = 42

Simplifying
x = 42

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