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105=x+45-80
We move all terms to the left:
105-(x+45-80)=0
We add all the numbers together, and all the variables
-(x-35)+105=0
We get rid of parentheses
-x+35+105=0
We add all the numbers together, and all the variables
-1x+140=0
We move all terms containing x to the left, all other terms to the right
-x=-140
x=-140/-1
x=+140
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