81=-21x+-21+4x

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Solution for 81=-21x+-21+4x equation: 



81=-21x+-21+4x

We move all terms to the left:

81-(-21x+-21+4x)=0

We add all the numbers together, and all the variables

-(-17x-21)+81=0

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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