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100=30+35x
We move all terms to the left:
100-(30+35x)=0
We add all the numbers together, and all the variables
-(35x+30)+100=0
We get rid of parentheses
-35x-30+100=0
We add all the numbers together, and all the variables
-35x+70=0
We move all terms containing x to the left, all other terms to the right
-35x=-70
x=-70/-35
x=+2
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