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0.75(16-s)+0.5s=9
We move all terms to the left:
0.75(16-s)+0.5s-(9)=0
We add all the numbers together, and all the variables
0.75(-1s+16)+0.5s-9=0
We add all the numbers together, and all the variables
0.5s+0.75(-1s+16)-9=0
We multiply parentheses
0.5s-0.75s+12-9=0
We add all the numbers together, and all the variables
-0.25s+3=0
We move all terms containing s to the left, all other terms to the right
-0.25s=-3
s=-3/-0.25
s=+12
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