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+(S+0.89)=99.99
We move all terms to the left:
+(S+0.89)-(99.99)=0
We add all the numbers together, and all the variables
(S+0.89)-99.99=0
We get rid of parentheses
S+0.89-99.99=0
We add all the numbers together, and all the variables
S-99.1=0
We move all terms containing S to the left, all other terms to the right
S=99.1
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