4x-21=7x-6

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



4x-21=7x-6

We move all terms to the left:

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

We get rid of parentheses

4x-7x+6-21=0

We add all the numbers together, and all the variables

-3x-15=0

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

-3x=15

x=15/-3

x=-5

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