7x-21=90

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Solution for 7x-21=90 equation: 



7x-21=90

We move all terms to the left:

7x-21-(90)=0

We add all the numbers together, and all the variables

7x-111=0

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

7x=111

x=111/7

x=15+6/7

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