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8x+4(x+4)=28
We move all terms to the left:
8x+4(x+4)-(28)=0
We multiply parentheses
8x+4x+16-28=0
We add all the numbers together, and all the variables
12x-12=0
We move all terms containing x to the left, all other terms to the right
12x=12
x=12/12
x=1
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