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125-100=45x+30x
We move all terms to the left:
125-100-(45x+30x)=0
We add all the numbers together, and all the variables
-(+75x)+125-100=0
We add all the numbers together, and all the variables
-(+75x)+25=0
We get rid of parentheses
-75x+25=0
We move all terms containing x to the left, all other terms to the right
-75x=-25
x=-25/-75
x=1/3
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