80-4x=100-y

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Solution for 80-4x=100-y equation: 


Simplifying
80 + -4x = 100 + -1y

Solving
80 + -4x = 100 + -1y

Solving for variable 'x'.

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

Add '-80' to each side of the equation.
80 + -80 + -4x = 100 + -80 + -1y

Combine like terms: 80 + -80 = 0
0 + -4x = 100 + -80 + -1y
-4x = 100 + -80 + -1y

Combine like terms: 100 + -80 = 20
-4x = 20 + -1y

Divide each side by '-4'.
x = -5 + 0.25y

Simplifying
x = -5 + 0.25y

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