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(.5x-20)+(2x+10)=180
We move all terms to the left:
(.5x-20)+(2x+10)-(180)=0
We get rid of parentheses
.5x+2x-20+10-180=0
We add all the numbers together, and all the variables
2.5x-190=0
We move all terms containing x to the left, all other terms to the right
2.5x=190
x=190/2.5
x=76
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