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71+8x-1+10x+6+13x-2=540
We move all terms to the left:
71+8x-1+10x+6+13x-2-(540)=0
We add all the numbers together, and all the variables
31x-466=0
We move all terms containing x to the left, all other terms to the right
31x=466
x=466/31
x=15+1/31
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