X-7-6=-21

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Solution for X-7-6=-21 equation: 


Simplifying
X + -7 + -6 = -21

Reorder the terms:
-7 + -6 + X = -21

Combine like terms: -7 + -6 = -13
-13 + X = -21

Solving
-13 + X = -21

Solving for variable 'X'.

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

Add '13' to each side of the equation.
-13 + 13 + X = -21 + 13

Combine like terms: -13 + 13 = 0
0 + X = -21 + 13
X = -21 + 13

Combine like terms: -21 + 13 = -8
X = -8

Simplifying
X = -8

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