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4x+x+x-3-9+4x=6
We move all terms to the left:
4x+x+x-3-9+4x-(6)=0
We add all the numbers together, and all the variables
10x-18=0
We move all terms containing x to the left, all other terms to the right
10x=18
x=18/10
x=1+4/5
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