X+4+x=84

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Solution for X+4+x=84 equation: 



X+4+X=84

We move all terms to the left:

X+4+X-(84)=0

We add all the numbers together, and all the variables

2X-80=0

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

2X=80

X=80/2

X=40

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