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x+2x+4x+6x+8x+10x+12x=1000000000
We move all terms to the left:
x+2x+4x+6x+8x+10x+12x-(1000000000)=0
We add all the numbers together, and all the variables
43x-1000000000=0
We move all terms containing x to the left, all other terms to the right
43x=1000000000
x=1000000000/43
x=23255813+41/43
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