9-x-4x=84

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Solution for 9-x-4x=84 equation: 



9-x-4x=84

We move all terms to the left:

9-x-4x-(84)=0

We add all the numbers together, and all the variables

-5x-75=0

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

-5x=75

x=75/-5

x=-15

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