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-421+15x=23x+115
We move all terms to the left:
-421+15x-(23x+115)=0
We get rid of parentheses
15x-23x-115-421=0
We add all the numbers together, and all the variables
-8x-536=0
We move all terms containing x to the left, all other terms to the right
-8x=536
x=536/-8
x=-67
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