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2(13x-21)+85+31=360
We move all terms to the left:
2(13x-21)+85+31-(360)=0
We add all the numbers together, and all the variables
2(13x-21)-244=0
We multiply parentheses
26x-42-244=0
We add all the numbers together, and all the variables
26x-286=0
We move all terms containing x to the left, all other terms to the right
26x=286
x=286/26
x=11
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