7x-21=8x-4

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Solution for 7x-21=8x-4 equation: 



7x-21=8x-4

We move all terms to the left:

7x-21-(8x-4)=0

We get rid of parentheses

7x-8x+4-21=0

We add all the numbers together, and all the variables

-1x-17=0

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

-x=17

x=17/-1

x=-17

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