12x+6x=-21

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Solution for 12x+6x=-21 equation: 



12x+6x=-21

We move all terms to the left:

12x+6x-(-21)=0

We add all the numbers together, and all the variables

18x+21=0

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

18x=-21

x=-21/18

x=-1+1/6

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