7x-(12x-9)=21x+42

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Solution for 7x-(12x-9)=21x+42 equation: 



7x-(12x-9)=21x+42

We move all terms to the left:

7x-(12x-9)-(21x+42)=0

We get rid of parentheses

7x-12x-21x+9-42=0

We add all the numbers together, and all the variables

-26x-33=0

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

-26x=33

x=33/-26

x=-1+7/26

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