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12x+9=13+x+73
We move all terms to the left:
12x+9-(13+x+73)=0
We add all the numbers together, and all the variables
12x-(x+86)+9=0
We get rid of parentheses
12x-x-86+9=0
We add all the numbers together, and all the variables
11x-77=0
We move all terms containing x to the left, all other terms to the right
11x=77
x=77/11
x=7
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