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125+80+(-3x)+(45-x)+(-x+90)=540
We move all terms to the left:
125+80+(-3x)+(45-x)+(-x+90)-(540)=0
We add all the numbers together, and all the variables
(-3x)+(-1x+45)+(-1x+90)+125+80-540=0
We add all the numbers together, and all the variables
(-3x)+(-1x+45)+(-1x+90)-335=0
We get rid of parentheses
-3x-1x-1x+45+90-335=0
We add all the numbers together, and all the variables
-5x-200=0
We move all terms containing x to the left, all other terms to the right
-5x=200
x=200/-5
x=-40
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