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3.75=x-0.75x
We move all terms to the left:
3.75-(x-0.75x)=0
We add all the numbers together, and all the variables
-(+0.25x)+3.75=0
We get rid of parentheses
-0.25x+3.75=0
We move all terms containing x to the left, all other terms to the right
-0.25x=-3.75
x=-3.75/-0.25
x=+15
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