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4x-2x+3-6x=6+9
We move all terms to the left:
4x-2x+3-6x-(6+9)=0
We add all the numbers together, and all the variables
4x-2x-6x+3-15=0
We add all the numbers together, and all the variables
-4x-12=0
We move all terms containing x to the left, all other terms to the right
-4x=12
x=12/-4
x=-3
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