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4.20=0.75s
We move all terms to the left:
4.20-(0.75s)=0
We add all the numbers together, and all the variables
-(+0.75s)+4.20=0
We add all the numbers together, and all the variables
-(+0.75s)+4.2=0
We get rid of parentheses
-0.75s+4.2=0
We move all terms containing s to the left, all other terms to the right
-0.75s=-4.2
s=-4.2/-0.75
s=5+0.45/0.75
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