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x+x+42.5=180
We move all terms to the left:
x+x+42.5-(180)=0
We add all the numbers together, and all the variables
2x-137.5=0
We move all terms containing x to the left, all other terms to the right
2x=137.5
x=137.5/2
x=68+1/1.3333333333333
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