6x+21=7x+4

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Solution for 6x+21=7x+4 equation: 



6x+21=7x+4

We move all terms to the left:

6x+21-(7x+4)=0

We get rid of parentheses

6x-7x-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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