Solve for a
a=-1
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a+3=1\times 2
Multiply both sides by 2, the reciprocal of \frac{1}{2}.
a+3=2
Multiply 1 and 2 to get 2.
a=2-3
Subtract 3 from both sides.
a=-1
Subtract 3 from 2 to get -1.
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