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5(3x+9)=12x+45
We move all terms to the left:
5(3x+9)-(12x+45)=0
We multiply parentheses
15x-(12x+45)+45=0
We get rid of parentheses
15x-12x-45+45=0
We add all the numbers together, and all the variables
3x=0
x=0/3
x=0
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