3x+21=x(1-3x)

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Solution for 3x+21=x(1-3x) equation: 



3x+21=x(1-3x)

We move all terms to the left:

3x+21-(x(1-3x))=0

We add all the numbers together, and all the variables

3x-(x(-3x+1))+21=0



We calculate terms in parentheses: -(x(-3x+1)), so:

x(-3x+1)

We multiply parentheses

-3x^2+x

Back to the equation:

-(-3x^2+x)



We get rid of parentheses

3x^2-x+3x+21=0

We add all the numbers together, and all the variables

3x^2+2x+21=0

a = 3; b = 2; c = +21;
Δ = b2-4ac
Δ = 22-4·3·21
Δ = -248
Delta is less than zero, so there is no solution for the equation

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