.5(80-y)=25

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Solution for .5(80-y)=25 equation: 


Simplifying
0.5(80 + -1y) = 25
(80 * 0.5 + -1y * 0.5) = 25
(40 + -0.5y) = 25

Solving
40 + -0.5y = 25

Solving for variable 'y'.

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

Add '-40' to each side of the equation.
40 + -40 + -0.5y = 25 + -40

Combine like terms: 40 + -40 = 0
0 + -0.5y = 25 + -40
-0.5y = 25 + -40

Combine like terms: 25 + -40 = -15
-0.5y = -15

Divide each side by '-0.5'.
y = 30

Simplifying
y = 30

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