X+(-7)=21

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Solution for X+(-7)=21 equation: 


Simplifying
X + (-7) = 21
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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