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-x-15=3x+1
We move all terms to the left:
-x-15-(3x+1)=0
We add all the numbers together, and all the variables
-1x-(3x+1)-15=0
We get rid of parentheses
-1x-3x-1-15=0
We add all the numbers together, and all the variables
-4x-16=0
We move all terms containing x to the left, all other terms to the right
-4x=16
x=16/-4
x=-4
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