Solve for s
s=-8
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2\times 4=s+16
Multiply both sides by 4, the reciprocal of \frac{1}{4}.
8=s+16
Multiply 2 and 4 to get 8.
s+16=8
Swap sides so that all variable terms are on the left hand side.
s=8-16
Subtract 16 from both sides.
s=-8
Subtract 16 from 8 to get -8.
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