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x+70-x+30=x/2
We move all terms to the left:
x+70-x+30-(x/2)=0
We add all the numbers together, and all the variables
x-x-(+x/2)+70+30=0
We add all the numbers together, and all the variables
-(+x/2)+100=0
We get rid of parentheses
-x/2+100=0
We multiply all the terms by the denominator
-x+100*2=0
We add all the numbers together, and all the variables
-1x+200=0
We move all terms containing x to the left, all other terms to the right
-x=-200
x=-200/-1
x=+200
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