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-1.3S=6.5
We move all terms to the left:
-1.3S-(6.5)=0
We add all the numbers together, and all the variables
-1.3S-6.5=0
We move all terms containing S to the left, all other terms to the right
-1.3S=6.5
S=6.5/-1.3
S=-5
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