X+5+x+10+x+12=90

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Solution for X+5+x+10+x+12=90 equation: 



X+5+X+10+X+12=90

We move all terms to the left:

X+5+X+10+X+12-(90)=0

We add all the numbers together, and all the variables

3X-63=0

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

3X=63

X=63/3

X=21

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