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5x+3(x-4)=7x+9
We move all terms to the left:
5x+3(x-4)-(7x+9)=0
We multiply parentheses
5x+3x-(7x+9)-12=0
We get rid of parentheses
5x+3x-7x-9-12=0
We add all the numbers together, and all the variables
x-21=0
We move all terms containing x to the left, all other terms to the right
x=21
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