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4(4+5x)=16
We move all terms to the left:
4(4+5x)-(16)=0
We add all the numbers together, and all the variables
4(5x+4)-16=0
We multiply parentheses
20x+16-16=0
We add all the numbers together, and all the variables
20x=0
x=0/20
x=0
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