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x+x+20+x/2=120
We move all terms to the left:
x+x+20+x/2-(120)=0
We add all the numbers together, and all the variables
2x+x/2-100=0
We multiply all the terms by the denominator
2x*2+x-100*2=0
We add all the numbers together, and all the variables
x+2x*2-200=0
Wy multiply elements
x+4x-200=0
We add all the numbers together, and all the variables
5x-200=0
We move all terms containing x to the left, all other terms to the right
5x=200
x=200/5
x=40
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