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13x+15=19x-17+20
We move all terms to the left:
13x+15-(19x-17+20)=0
We add all the numbers together, and all the variables
13x-(19x+3)+15=0
We get rid of parentheses
13x-19x-3+15=0
We add all the numbers together, and all the variables
-6x+12=0
We move all terms containing x to the left, all other terms to the right
-6x=-12
x=-12/-6
x=+2
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