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12.75=x+1.375x
We move all terms to the left:
12.75-(x+1.375x)=0
We add all the numbers together, and all the variables
-(+2.375x)+12.75=0
We get rid of parentheses
-2.375x+12.75=0
We move all terms containing x to the left, all other terms to the right
-2.375x=-12.75
x=-12.75/-2.375
x=5+0.875/2.375
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