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=-100-0.6S
We move all terms to the left:
-(-100-0.6S)=0
We add all the numbers together, and all the variables
-(-0.6S-100)=0
We get rid of parentheses
0.6S+100=0
We move all terms containing S to the left, all other terms to the right
0.6S=-100
S=-100/0.6
S=-166+0.40000000000001/0.6
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