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x/2+x/2+100=180
We move all terms to the left:
x/2+x/2+100-(180)=0
We add all the numbers together, and all the variables
x/2+x/2-80=0
We multiply all the terms by the denominator
x+x-80*2=0
We add all the numbers together, and all the variables
2x-160=0
We move all terms containing x to the left, all other terms to the right
2x=160
x=160/2
x=80
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