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13-x+4=4x-28
We move all terms to the left:
13-x+4-(4x-28)=0
We add all the numbers together, and all the variables
-1x-(4x-28)+17=0
We get rid of parentheses
-1x-4x+28+17=0
We add all the numbers together, and all the variables
-5x+45=0
We move all terms containing x to the left, all other terms to the right
-5x=-45
x=-45/-5
x=+9
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