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(x+20)+(2x-10)+(x/2+30)=180
We move all terms to the left:
(x+20)+(2x-10)+(x/2+30)-(180)=0
We get rid of parentheses
x+2x+x/2+20-10+30-180=0
We multiply all the terms by the denominator
x*2+2x*2+x+20*2-10*2+30*2-180*2=0
We add all the numbers together, and all the variables
x+x*2+2x*2-280=0
Wy multiply elements
x+2x+4x-280=0
We add all the numbers together, and all the variables
7x-280=0
We move all terms containing x to the left, all other terms to the right
7x=280
x=280/7
x=40
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