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0.75(12+s)=30
We move all terms to the left:
0.75(12+s)-(30)=0
We add all the numbers together, and all the variables
0.75(s+12)-30=0
We multiply parentheses
0.75s+9-30=0
We add all the numbers together, and all the variables
0.75s-21=0
We move all terms containing s to the left, all other terms to the right
0.75s=21
s=21/0.75
s=28
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