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x+x*2+x*3=108
We move all terms to the left:
x+x*2+x*3-(108)=0
Wy multiply elements
x+2x+3x-108=0
We add all the numbers together, and all the variables
6x-108=0
We move all terms containing x to the left, all other terms to the right
6x=108
x=108/6
x=18
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