3x-5+x-1=7x-21

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Solution for 3x-5+x-1=7x-21 equation: 



3x-5+x-1=7x-21

We move all terms to the left:

3x-5+x-1-(7x-21)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

4x-7x+21-6=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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