Solve for y
y=7
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-13=3y+15-7y
Use the distributive property to multiply 3 by y+5.
-13=-4y+15
Combine 3y and -7y to get -4y.
-4y+15=-13
Swap sides so that all variable terms are on the left hand side.
-4y=-13-15
Subtract 15 from both sides.
-4y=-28
Subtract 15 from -13 to get -28.
y=\frac{-28}{-4}
Divide both sides by -4.
y=7
Divide -28 by -4 to get 7.
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