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-1.4S=6.4
We move all terms to the left:
-1.4S-(6.4)=0
We add all the numbers together, and all the variables
-1.4S-6.4=0
We move all terms containing S to the left, all other terms to the right
-1.4S=6.4
S=6.4/-1.4
S=-4+0.8/1.4
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