Solve for y
y=15
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80=5y+4+1
Combine 3y and 2y to get 5y.
80=5y+5
Add 4 and 1 to get 5.
5y+5=80
Swap sides so that all variable terms are on the left hand side.
5y=80-5
Subtract 5 from both sides.
5y=75
Subtract 5 from 80 to get 75.
y=\frac{75}{5}
Divide both sides by 5.
y=15
Divide 75 by 5 to get 15.
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