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4(3x+9)=21x+33-9x+3
We move all terms to the left:
4(3x+9)-(21x+33-9x+3)=0
We add all the numbers together, and all the variables
4(3x+9)-(12x+36)=0
We multiply parentheses
12x-(12x+36)+36=0
We get rid of parentheses
12x-12x-36+36=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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