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-15=5x+8-4x
We move all terms to the left:
-15-(5x+8-4x)=0
We add all the numbers together, and all the variables
-(x+8)-15=0
We get rid of parentheses
-x-8-15=0
We add all the numbers together, and all the variables
-1x-23=0
We move all terms containing x to the left, all other terms to the right
-x=23
x=23/-1
x=-23
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