15-y=4y

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Solution for 15-y=4y equation:


Simplifying
15 + -1y = 4y

Solving
15 + -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.
15 + -1y + -4y = 4y + -4y

Combine like terms: -1y + -4y = -5y
15 + -5y = 4y + -4y

Combine like terms: 4y + -4y = 0
15 + -5y = 0

Add '-15' to each side of the equation.
15 + -15 + -5y = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -5y = 0 + -15
-5y = 0 + -15

Combine like terms: 0 + -15 = -15
-5y = -15

Divide each side by '-5'.
y = 3

Simplifying
y = 3

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