7x-7-6x-6=3x-21

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Solution for 7x-7-6x-6=3x-21 equation: 



7x-7-6x-6=3x-21

We move all terms to the left:

7x-7-6x-6-(3x-21)=0

We add all the numbers together, and all the variables

x-(3x-21)-13=0

We get rid of parentheses

x-3x+21-13=0

We add all the numbers together, and all the variables

-2x+8=0

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

-2x=-8

x=-8/-2

x=+4

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