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1x+2x+3x+4x+5x+6x+7x+8x+9x+10x=66x
We move all terms to the left:
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x-(66x)=0
We add all the numbers together, and all the variables
-11x=0
x=0/-11
x=0
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