20-x=42-4y

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Solution for 20-x=42-4y equation: 


Simplifying
20 + -1x = 42 + -4y

Solving
20 + -1x = 42 + -4y

Solving for variable 'x'.

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

Add '-20' to each side of the equation.
20 + -20 + -1x = 42 + -20 + -4y

Combine like terms: 20 + -20 = 0
0 + -1x = 42 + -20 + -4y
-1x = 42 + -20 + -4y

Combine like terms: 42 + -20 = 22
-1x = 22 + -4y

Divide each side by '-1'.
x = -22 + 4y

Simplifying
x = -22 + 4y

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