-8-1=x-21

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Solution for -8-1=x-21 equation:


Simplifying
-8 + -1 = x + -21

Combine like terms: -8 + -1 = -9
-9 = x + -21

Reorder the terms:
-9 = -21 + x

Solving
-9 = -21 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
-9 + -1x = -21 + x + -1x

Combine like terms: x + -1x = 0
-9 + -1x = -21 + 0
-9 + -1x = -21

Add '9' to each side of the equation.
-9 + 9 + -1x = -21 + 9

Combine like terms: -9 + 9 = 0
0 + -1x = -21 + 9
-1x = -21 + 9

Combine like terms: -21 + 9 = -12
-1x = -12

Divide each side by '-1'.
x = 12

Simplifying
x = 12

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