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13x+7x=1+9x+21
We move all terms to the left:
13x+7x-(1+9x+21)=0
We add all the numbers together, and all the variables
13x+7x-(9x+22)=0
We add all the numbers together, and all the variables
20x-(9x+22)=0
We get rid of parentheses
20x-9x-22=0
We add all the numbers together, and all the variables
11x-22=0
We move all terms containing x to the left, all other terms to the right
11x=22
x=22/11
x=2
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