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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+70)-(x+30)-(+x/2)=0
We get rid of parentheses
x-x-x/2+70-30=0
We multiply all the terms by the denominator
x*2-x*2-x+70*2-30*2=0
We add all the numbers together, and all the variables
-1x+x*2-x*2+80=0
Wy multiply elements
-1x+2x-2x+80=0
We add all the numbers together, and all the variables
-1x+80=0
We move all terms containing x to the left, all other terms to the right
-x=-80
x=-80/-1
x=+80
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