Solve for s
s=400
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150+0.2s=230
Swap sides so that all variable terms are on the left hand side.
0.2s=230-150
Subtract 150 from both sides.
0.2s=80
Subtract 150 from 230 to get 80.
s=\frac{80}{0.2}
Divide both sides by 0.2.
s=\frac{800}{2}
Expand \frac{80}{0.2} by multiplying both numerator and the denominator by 10.
s=400
Divide 800 by 2 to get 400.
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