77=7x+3(x+9)

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Solution for 77=7x+3(x+9) equation: 



77=7x+3(x+9)

We move all terms to the left:

77-(7x+3(x+9))=0



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

7x+3(x+9)

We multiply parentheses

7x+3x+27

We add all the numbers together, and all the variables

10x+27

Back to the equation:

-(10x+27)



We get rid of parentheses

-10x-27+77=0

We add all the numbers together, and all the variables

-10x+50=0

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

-10x=-50

x=-50/-10

x=+5

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