X+1+x+2+x+3=90

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Solution for X+1+x+2+x+3=90 equation: 



X+1+X+2+X+3=90

We move all terms to the left:

X+1+X+2+X+3-(90)=0

We add all the numbers together, and all the variables

3X-84=0

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

3X=84

X=84/3

X=28

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