5x+7x=7(3x+9)

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Solution for 5x+7x=7(3x+9) equation: 



5x+7x=7(3x+9)

We move all terms to the left:

5x+7x-(7(3x+9))=0

We add all the numbers together, and all the variables

12x-(7(3x+9))=0



We calculate terms in parentheses: -(7(3x+9)), so:

7(3x+9)

We multiply parentheses

21x+63

Back to the equation:

-(21x+63)



We get rid of parentheses

12x-21x-63=0

We add all the numbers together, and all the variables

-9x-63=0

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

-9x=63

x=63/-9

x=-7

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