75-y=4(y)

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Solution for 75-y=4(y) equation:


Simplifying
75 + -1y = 4(y)

Solving
75 + -1y = 4y

Solving for variable 'y'.

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

Add '-4y' to each side of the equation.
75 + -1y + -4y = 4y + -4y

Combine like terms: -1y + -4y = -5y
75 + -5y = 4y + -4y

Combine like terms: 4y + -4y = 0
75 + -5y = 0

Add '-75' to each side of the equation.
75 + -75 + -5y = 0 + -75

Combine like terms: 75 + -75 = 0
0 + -5y = 0 + -75
-5y = 0 + -75

Combine like terms: 0 + -75 = -75
-5y = -75

Divide each side by '-5'.
y = 15

Simplifying
y = 15

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