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4x+2(x+2)=40
We move all terms to the left:
4x+2(x+2)-(40)=0
We multiply parentheses
4x+2x+4-40=0
We add all the numbers together, and all the variables
6x-36=0
We move all terms containing x to the left, all other terms to the right
6x=36
x=36/6
x=6
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