6x+12x=-72

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Solution for 6x+12x=-72 equation: 



6x+12x=-72

We move all terms to the left:

6x+12x-(-72)=0

We add all the numbers together, and all the variables

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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