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13+4x=5x+4x
We move all terms to the left:
13+4x-(5x+4x)=0
We add all the numbers together, and all the variables
4x-(+9x)+13=0
We get rid of parentheses
4x-9x+13=0
We add all the numbers together, and all the variables
-5x+13=0
We move all terms containing x to the left, all other terms to the right
-5x=-13
x=-13/-5
x=2+3/5
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