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100-3x=30+2x
We move all terms to the left:
100-3x-(30+2x)=0
We add all the numbers together, and all the variables
-3x-(2x+30)+100=0
We get rid of parentheses
-3x-2x-30+100=0
We add all the numbers together, and all the variables
-5x+70=0
We move all terms containing x to the left, all other terms to the right
-5x=-70
x=-70/-5
x=+14
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