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3(4x+8)=21x+11-9x+13
We move all terms to the left:
3(4x+8)-(21x+11-9x+13)=0
We add all the numbers together, and all the variables
3(4x+8)-(12x+24)=0
We multiply parentheses
12x-(12x+24)+24=0
We get rid of parentheses
12x-12x-24+24=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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