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