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13x-99=220+20x
We move all terms to the left:
13x-99-(220+20x)=0
We add all the numbers together, and all the variables
13x-(20x+220)-99=0
We get rid of parentheses
13x-20x-220-99=0
We add all the numbers together, and all the variables
-7x-319=0
We move all terms containing x to the left, all other terms to the right
-7x=319
x=319/-7
x=-45+4/7
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