5x-9+21=90

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Solution for 5x-9+21=90 equation: 



5x-9+21=90

We move all terms to the left:

5x-9+21-(90)=0

We add all the numbers together, and all the variables

5x-78=0

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

5x=78

x=78/5

x=15+3/5

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