Solve for s
s=-5
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7s+28=-7
Swap sides so that all variable terms are on the left hand side.
7s=-7-28
Subtract 28 from both sides.
7s=-35
Subtract 28 from -7 to get -35.
s=\frac{-35}{7}
Divide both sides by 7.
s=-5
Divide -35 by 7 to get -5.
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