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15+13=23+x
We move all terms to the left:
15+13-(23+x)=0
We add all the numbers together, and all the variables
-(x+23)+15+13=0
We add all the numbers together, and all the variables
-(x+23)+28=0
We get rid of parentheses
-x-23+28=0
We add all the numbers together, and all the variables
-1x+5=0
We move all terms containing x to the left, all other terms to the right
-x=-5
x=-5/-1
x=+5
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