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140=x+0.75x
We move all terms to the left:
140-(x+0.75x)=0
We add all the numbers together, and all the variables
-(+1.75x)+140=0
We get rid of parentheses
-1.75x+140=0
We move all terms containing x to the left, all other terms to the right
-1.75x=-140
x=-140/-1.75
x=+80
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