20=4+x+x

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Solution for 20=4+x+x equation: 


Simplifying
20 = 4 + x + x

Combine like terms: x + x = 2x
20 = 4 + 2x

Solving
20 = 4 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
20 + -2x = 4 + 2x + -2x

Combine like terms: 2x + -2x = 0
20 + -2x = 4 + 0
20 + -2x = 4

Add '-20' to each side of the equation.
20 + -20 + -2x = 4 + -20

Combine like terms: 20 + -20 = 0
0 + -2x = 4 + -20
-2x = 4 + -20

Combine like terms: 4 + -20 = -16
-2x = -16

Divide each side by '-2'.
x = 8

Simplifying
x = 8

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