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13+4x-9=7x+7x-3x
We move all terms to the left:
13+4x-9-(7x+7x-3x)=0
We add all the numbers together, and all the variables
4x-(+11x)+13-9=0
We add all the numbers together, and all the variables
4x-(+11x)+4=0
We get rid of parentheses
4x-11x+4=0
We add all the numbers together, and all the variables
-7x+4=0
We move all terms containing x to the left, all other terms to the right
-7x=-4
x=-4/-7
x=4/7
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