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x-43+x-39+2x-28=180
We move all terms to the left:
x-43+x-39+2x-28-(180)=0
We add all the numbers together, and all the variables
4x-290=0
We move all terms containing x to the left, all other terms to the right
4x=290
x=290/4
x=72+1/2
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