20=x+21

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Solution for 20=x+21 equation:


Simplifying
20 = x + 21

Reorder the terms:
20 = 21 + x

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

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

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

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

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

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

Simplifying
x = -1

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