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21x+3(5x+4)=39
We move all terms to the left:
21x+3(5x+4)-(39)=0
We multiply parentheses
21x+15x+12-39=0
We add all the numbers together, and all the variables
36x-27=0
We move all terms containing x to the left, all other terms to the right
36x=27
x=27/36
x=3/4
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