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3x+6x+12x+18x+24x+30x+36x+42x=2310
We move all terms to the left:
3x+6x+12x+18x+24x+30x+36x+42x-(2310)=0
We add all the numbers together, and all the variables
171x-2310=0
We move all terms containing x to the left, all other terms to the right
171x=2310
x=2310/171
x=13+29/57
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