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x+(x*10)=100
We move all terms to the left:
x+(x*10)-(100)=0
We add all the numbers together, and all the variables
x+(+x*10)-100=0
We get rid of parentheses
x+x*10-100=0
Wy multiply elements
x+10x-100=0
We add all the numbers together, and all the variables
11x-100=0
We move all terms containing x to the left, all other terms to the right
11x=100
x=100/11
x=9+1/11
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