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140=45+x
We move all terms to the left:
140-(45+x)=0
We add all the numbers together, and all the variables
-(x+45)+140=0
We get rid of parentheses
-x-45+140=0
We add all the numbers together, and all the variables
-1x+95=0
We move all terms containing x to the left, all other terms to the right
-x=-95
x=-95/-1
x=+95
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