15x+6x=84

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Solution for 15x+6x=84 equation: 



15x+6x=84

We move all terms to the left:

15x+6x-(84)=0

We add all the numbers together, and all the variables

21x-84=0

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

21x=84

x=84/21

x=4

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