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.5s+1=7+4.5
We move all terms to the left:
.5s+1-(7+4.5)=0
We add all the numbers together, and all the variables
.5s+1-(11.5)=0
We add all the numbers together, and all the variables
.5s-10.5=0
We move all terms containing s to the left, all other terms to the right
.5s=10.5
s=10.5/.5
s=21
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