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13+4=20x-x
We move all terms to the left:
13+4-(20x-x)=0
We add all the numbers together, and all the variables
-(+19x)+13+4=0
We add all the numbers together, and all the variables
-(+19x)+17=0
We get rid of parentheses
-19x+17=0
We move all terms containing x to the left, all other terms to the right
-19x=-17
x=-17/-19
x=17/19
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