3x+6x=-72

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Solution for 3x+6x=-72 equation: 



3x+6x=-72

We move all terms to the left:

3x+6x-(-72)=0

We add all the numbers together, and all the variables

9x+72=0

We move all terms containing x to the left, all other terms to the right

9x=-72

x=-72/9

x=-8

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