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10(3+s)=45
We move all terms to the left:
10(3+s)-(45)=0
We add all the numbers together, and all the variables
10(s+3)-45=0
We multiply parentheses
10s+30-45=0
We add all the numbers together, and all the variables
10s-15=0
We move all terms containing s to the left, all other terms to the right
10s=15
s=15/10
s=1+1/2
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