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4x+15=5x-6
We move all terms to the left:
4x+15-(5x-6)=0
We get rid of parentheses
4x-5x+6+15=0
We add all the numbers together, and all the variables
-1x+21=0
We move all terms containing x to the left, all other terms to the right
-x=-21
x=-21/-1
x=+21
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