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4x-15=6x+3x
We move all terms to the left:
4x-15-(6x+3x)=0
We add all the numbers together, and all the variables
4x-(+9x)-15=0
We get rid of parentheses
4x-9x-15=0
We add all the numbers together, and all the variables
-5x-15=0
We move all terms containing x to the left, all other terms to the right
-5x=15
x=15/-5
x=-3
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