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x+(x-87.2)=180
We move all terms to the left:
x+(x-87.2)-(180)=0
We get rid of parentheses
x+x-87.2-180=0
We add all the numbers together, and all the variables
2x-267.2=0
We move all terms containing x to the left, all other terms to the right
2x=267.2
x=267.2/2
x=133+1/1.6666666666667
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