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6x+3(7x+8)=240
We move all terms to the left:
6x+3(7x+8)-(240)=0
We multiply parentheses
6x+21x+24-240=0
We add all the numbers together, and all the variables
27x-216=0
We move all terms containing x to the left, all other terms to the right
27x=216
x=216/27
x=8
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