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4x-15=3x+7x=
We move all terms to the left:
4x-15-(3x+7x)=0
We add all the numbers together, and all the variables
4x-(+10x)-15=0
We get rid of parentheses
4x-10x-15=0
We add all the numbers together, and all the variables
-6x-15=0
We move all terms containing x to the left, all other terms to the right
-6x=15
x=15/-6
x=-2+1/2
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