3x(2x+1)=3x-12

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Solution for 3x(2x+1)=3x-12 equation: 



3x(2x+1)=3x-12

We move all terms to the left:

3x(2x+1)-(3x-12)=0

We multiply parentheses

6x^2+3x-(3x-12)=0

We get rid of parentheses

6x^2+3x-3x+12=0

We add all the numbers together, and all the variables

6x^2+12=0

a = 6; b = 0; c = +12;
Δ = b2-4ac
Δ = 02-4·6·12
Δ = -288
Delta is less than zero, so there is no solution for the equation

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