9x+21=4x+91

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Solution for 9x+21=4x+91 equation: 



9x+21=4x+91

We move all terms to the left:

9x+21-(4x+91)=0

We get rid of parentheses

9x-4x-91+21=0

We add all the numbers together, and all the variables

5x-70=0

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

5x=70

x=70/5

x=14

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