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100=9x+18x+x
We move all terms to the left:
100-(9x+18x+x)=0
We add all the numbers together, and all the variables
-(+28x)+100=0
We get rid of parentheses
-28x+100=0
We move all terms containing x to the left, all other terms to the right
-28x=-100
x=-100/-28
x=3+4/7
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