13x+21=90

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Solution for 13x+21=90 equation: 



13x+21=90

We move all terms to the left:

13x+21-(90)=0

We add all the numbers together, and all the variables

13x-69=0

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

13x=69

x=69/13

x=5+4/13

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