-21=x+(-20)

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Solution for -21=x+(-20) equation:


Simplifying
-21 = x + (-20)
-21 = x + -20

Reorder the terms:
-21 = -20 + x

Solving
-21 = -20 + 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.
-21 + -1x = -20 + x + -1x

Combine like terms: x + -1x = 0
-21 + -1x = -20 + 0
-21 + -1x = -20

Add '21' to each side of the equation.
-21 + 21 + -1x = -20 + 21

Combine like terms: -21 + 21 = 0
0 + -1x = -20 + 21
-1x = -20 + 21

Combine like terms: -20 + 21 = 1
-1x = 1

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

Simplifying
x = -1

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