21x+84/(x+4)(5x-20)=-5

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Solution for 21x+84/(x+4)(5x-20)=-5 equation: 



21x+84/(x+4)(5x-20)=-5

We move all terms to the left:

21x+84/(x+4)(5x-20)-(-5)=0



Domain of the equation: (x+4)(5x-20)!=0

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

x+4)(5x!=20

x∈R



We add all the numbers together, and all the variables

21x+84/(x+4)(5x-20)+5=0

We multiply parentheses ..

84/(+5x^2-20x+20x-80)+21x+5=0

We multiply all the terms by the denominator


21x*(+5x^2-20x+20x-80)+5*(+5x^2-20x+20x-80)+84=0

We multiply parentheses

105x^3-420x^2+420x^2+25x^2-1680x-100x+100x-400+84=0

We do not support expression: x^3

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