9x+3+9x+3=21x-3

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Solution for 9x+3+9x+3=21x-3 equation: 



9x+3+9x+3=21x-3

We move all terms to the left:

9x+3+9x+3-(21x-3)=0

We add all the numbers together, and all the variables

18x-(21x-3)+6=0

We get rid of parentheses

18x-21x+3+6=0

We add all the numbers together, and all the variables

-3x+9=0

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

-3x=-9

x=-9/-3

x=+3

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