21x+6=90x

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Solution for 21x+6=90x equation: 



21x+6=90x

We move all terms to the left:

21x+6-(90x)=0

We add all the numbers together, and all the variables

-69x+6=0

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

-69x=-6

x=-6/-69

x=2/23

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