X+x+x+3=80

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Solution for X+x+x+3=80 equation: 



X+X+X+3=80

We move all terms to the left:

X+X+X+3-(80)=0

We add all the numbers together, and all the variables

3X-77=0

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

3X=77

X=77/3

X=25+2/3

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