9x-21=7x+19

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Solution for 9x-21=7x+19 equation: 



9x-21=7x+19

We move all terms to the left:

9x-21-(7x+19)=0

We get rid of parentheses

9x-7x-19-21=0

We add all the numbers together, and all the variables

2x-40=0

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

2x=40

x=40/2

x=20

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