15=30+5y

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Solution for 15=30+5y equation: 


Simplifying
15 = 30 + 5y

Solving
15 = 30 + 5y

Solving for variable 'y'.

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

Add '-5y' to each side of the equation.
15 + -5y = 30 + 5y + -5y

Combine like terms: 5y + -5y = 0
15 + -5y = 30 + 0
15 + -5y = 30

Add '-15' to each side of the equation.
15 + -15 + -5y = 30 + -15

Combine like terms: 15 + -15 = 0
0 + -5y = 30 + -15
-5y = 30 + -15

Combine like terms: 30 + -15 = 15
-5y = 15

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

Simplifying
y = -3

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