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4(4x+2)=21x+4-5x+4
We move all terms to the left:
4(4x+2)-(21x+4-5x+4)=0
We add all the numbers together, and all the variables
4(4x+2)-(16x+8)=0
We multiply parentheses
16x-(16x+8)+8=0
We get rid of parentheses
16x-16x-8+8=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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