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s+(s+7.8)=720.2
We move all terms to the left:
s+(s+7.8)-(720.2)=0
We add all the numbers together, and all the variables
s+(s+7.8)-720.2=0
We get rid of parentheses
s+s+7.8-720.2=0
We add all the numbers together, and all the variables
2s-712.4=0
We move all terms containing s to the left, all other terms to the right
2s=712.4
s=712.4/2
s=356+0.4/2
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