Solve for y
y=\frac{8}{21}\approx 0.380952381
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-3+21y=5
Combine 6y and 15y to get 21y.
21y=5+3
Add 3 to both sides.
21y=8
Add 5 and 3 to get 8.
y=\frac{8}{21}
Divide both sides by 21.
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