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13-7x=23-2x
We move all terms to the left:
13-7x-(23-2x)=0
We add all the numbers together, and all the variables
-7x-(-2x+23)+13=0
We get rid of parentheses
-7x+2x-23+13=0
We add all the numbers together, and all the variables
-5x-10=0
We move all terms containing x to the left, all other terms to the right
-5x=10
x=10/-5
x=-2
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