4(20+-.5y)+2y=80

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Solution for 4(20+-.5y)+2y=80 equation: 


Simplifying
4(20 + -0.5y) + 2y = 80
(20 * 4 + -0.5y * 4) + 2y = 80
(80 + -2y) + 2y = 80

Combine like terms: -2y + 2y = 0
80 + 0 = 80
80 = 80

Add '-80' to each side of the equation.
80 + -80 = 80 + -80

Combine like terms: 80 + -80 = 0
0 = 80 + -80

Combine like terms: 80 + -80 = 0
0 = 0

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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