12x+8x=84

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Solution for 12x+8x=84 equation: 



12x+8x=84

We move all terms to the left:

12x+8x-(84)=0

We add all the numbers together, and all the variables

20x-84=0

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

20x=84

x=84/20

x=4+1/5

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