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-111=0

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

13x=111

x=111/13

x=8+7/13

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