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15=5x+23-x
We move all terms to the left:
15-(5x+23-x)=0
We add all the numbers together, and all the variables
-(4x+23)+15=0
We get rid of parentheses
-4x-23+15=0
We add all the numbers together, and all the variables
-4x-8=0
We move all terms containing x to the left, all other terms to the right
-4x=8
x=8/-4
x=-2
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