X+7+x=87

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Solution for X+7+x=87 equation: 



X+7+X=87

We move all terms to the left:

X+7+X-(87)=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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