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40=35+x
We move all terms to the left:
40-(35+x)=0
We add all the numbers together, and all the variables
-(x+35)+40=0
We get rid of parentheses
-x-35+40=0
We add all the numbers together, and all the variables
-1x+5=0
We move all terms containing x to the left, all other terms to the right
-x=-5
x=-5/-1
x=+5
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