21+4d=-7(6d-3)d=0

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Solution for 21+4d=-7(6d-3)d=0 equation: 



21+4d=-7(6d-3)d=0

We move all terms to the left:

21+4d-(-7(6d-3)d)=0



We calculate terms in parentheses: -(-7(6d-3)d), so:

-7(6d-3)d

We multiply parentheses

-42d^2+21d

Back to the equation:

-(-42d^2+21d)



We get rid of parentheses

42d^2-21d+4d+21=0

We add all the numbers together, and all the variables

42d^2-17d+21=0

a = 42; b = -17; c = +21;
Δ = b2-4ac
Δ = -172-4·42·21
Δ = -3239
Delta is less than zero, so there is no solution for the equation

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