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4(4x+4)=21x
We move all terms to the left:
4(4x+4)-(21x)=0
We add all the numbers together, and all the variables
-21x+4(4x+4)=0
We multiply parentheses
-21x+16x+16=0
We add all the numbers together, and all the variables
-5x+16=0
We move all terms containing x to the left, all other terms to the right
-5x=-16
x=-16/-5
x=3+1/5
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