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4x+6+5x+113+4x+6=540
We move all terms to the left:
4x+6+5x+113+4x+6-(540)=0
We add all the numbers together, and all the variables
13x-415=0
We move all terms containing x to the left, all other terms to the right
13x=415
x=415/13
x=31+12/13
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