21=7(x+4)+5(6+6x)

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Solution for 21=7(x+4)+5(6+6x) equation: 



21=7(x+4)+5(6+6x)

We move all terms to the left:

21-(7(x+4)+5(6+6x))=0

We add all the numbers together, and all the variables

-(7(x+4)+5(6x+6))+21=0



We calculate terms in parentheses: -(7(x+4)+5(6x+6)), so:

7(x+4)+5(6x+6)

We multiply parentheses

7x+30x+28+30

We add all the numbers together, and all the variables

37x+58

Back to the equation:

-(37x+58)



We get rid of parentheses

-37x-58+21=0

We add all the numbers together, and all the variables

-37x-37=0

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

-37x=37

x=37/-37

x=-1

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