12= \frac{ 1 }{ 2 } (y+9
Solve for y
y=15
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12\times 2=y+9
Multiply both sides by 2, the reciprocal of \frac{1}{2}.
24=y+9
Multiply 12 and 2 to get 24.
y+9=24
Swap sides so that all variable terms are on the left hand side.
y=24-9
Subtract 9 from both sides.
y=15
Subtract 9 from 24 to get 15.
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