-3x-12-21x=72

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Solution for -3x-12-21x=72 equation: 



-3x-12-21x=72

We move all terms to the left:

-3x-12-21x-(72)=0

We add all the numbers together, and all the variables

-24x-84=0

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

-24x=84

x=84/-24

x=-3+1/2

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