20=4-x

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Solution for 20=4-x equation:


Simplifying
20 = 4 + -1x

Solving
20 = 4 + -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.
20 + x = 4 + -1x + x

Combine like terms: -1x + x = 0
20 + x = 4 + 0
20 + x = 4

Add '-20' to each side of the equation.
20 + -20 + x = 4 + -20

Combine like terms: 20 + -20 = 0
0 + x = 4 + -20
x = 4 + -20

Combine like terms: 4 + -20 = -16
x = -16

Simplifying
x = -16

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