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X+X-1+X-2+X-3+X-4+X-5+X-6=70
We move all terms to the left:
X+X-1+X-2+X-3+X-4+X-5+X-6-(70)=0
We add all the numbers together, and all the variables
7X-91=0
We move all terms containing X to the left, all other terms to the right
7X=91
X=91/7
X=13
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