40=20-x

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Solution for 40=20-x equation:


Simplifying
40 = 20 + -1x

Solving
40 = 20 + -1x

Solving for variable 'x'.

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

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

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

Add '-40' to each side of the equation.
40 + -40 + x = 20 + -40

Combine like terms: 40 + -40 = 0
0 + x = 20 + -40
x = 20 + -40

Combine like terms: 20 + -40 = -20
x = -20

Simplifying
x = -20

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