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3x+6(6x+25)=-240
We move all terms to the left:
3x+6(6x+25)-(-240)=0
We add all the numbers together, and all the variables
3x+6(6x+25)+240=0
We multiply parentheses
3x+36x+150+240=0
We add all the numbers together, and all the variables
39x+390=0
We move all terms containing x to the left, all other terms to the right
39x=-390
x=-390/39
x=-10
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