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3(2x+4x)=-72
We move all terms to the left:
3(2x+4x)-(-72)=0
We add all the numbers together, and all the variables
3(+6x)-(-72)=0
We add all the numbers together, and all the variables
3(+6x)+72=0
We multiply parentheses
18x+72=0
We move all terms containing x to the left, all other terms to the right
18x=-72
x=-72/18
x=-4
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