Solve for y
y=9
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10y+4-8=86
Combine 3y and 7y to get 10y.
10y-4=86
Subtract 8 from 4 to get -4.
10y=86+4
Add 4 to both sides.
10y=90
Add 86 and 4 to get 90.
y=\frac{90}{10}
Divide both sides by 10.
y=9
Divide 90 by 10 to get 9.
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