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4x+2(x+9)=6
We move all terms to the left:
4x+2(x+9)-(6)=0
We multiply parentheses
4x+2x+18-6=0
We add all the numbers together, and all the variables
6x+12=0
We move all terms containing x to the left, all other terms to the right
6x=-12
x=-12/6
x=-2
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