21-2x-21=4

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Solution for 21-2x-21=4 equation: 


Simplifying
21 + -2x + -21 = 4

Reorder the terms:
21 + -21 + -2x = 4

Combine like terms: 21 + -21 = 0
0 + -2x = 4
-2x = 4

Solving
-2x = 4

Solving for variable 'x'.

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

Divide each side by '-2'.
x = -2

Simplifying
x = -2

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