81=2x+3(5x-7)

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Solution for 81=2x+3(5x-7) equation: 



81=2x+3(5x-7)

We move all terms to the left:

81-(2x+3(5x-7))=0



We calculate terms in parentheses: -(2x+3(5x-7)), so:

2x+3(5x-7)

We multiply parentheses

2x+15x-21

We add all the numbers together, and all the variables

17x-21

Back to the equation:

-(17x-21)



We get rid of parentheses

-17x+21+81=0

We add all the numbers together, and all the variables

-17x+102=0

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

-17x=-102

x=-102/-17

x=+6

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