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4x+2(2x+1)=18
We move all terms to the left:
4x+2(2x+1)-(18)=0
We multiply parentheses
4x+4x+2-18=0
We add all the numbers together, and all the variables
8x-16=0
We move all terms containing x to the left, all other terms to the right
8x=16
x=16/8
x=2
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