9x(4x+3)=7x-21

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Solution for 9x(4x+3)=7x-21 equation: 



9x(4x+3)=7x-21

We move all terms to the left:

9x(4x+3)-(7x-21)=0

We multiply parentheses

36x^2+27x-(7x-21)=0

We get rid of parentheses

36x^2+27x-7x+21=0

We add all the numbers together, and all the variables

36x^2+20x+21=0

a = 36; b = 20; c = +21;
Δ = b2-4ac
Δ = 202-4·36·21
Δ = -2624
Delta is less than zero, so there is no solution for the equation

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