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109=7x+2x+1
We move all terms to the left:
109-(7x+2x+1)=0
We add all the numbers together, and all the variables
-(9x+1)+109=0
We get rid of parentheses
-9x-1+109=0
We add all the numbers together, and all the variables
-9x+108=0
We move all terms containing x to the left, all other terms to the right
-9x=-108
x=-108/-9
x=+12
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