(5d-2)(3d-7)=0

Solution for (5d-2)(3d-7)=0 equation:

(5d-2)(3d-7)=0

We multiply parentheses ..

(+15d^2-35d-6d+14)=0

We get rid of parentheses

15d^2-35d-6d+14=0

We add all the numbers together, and all the variables

15d^2-41d+14=0

a = 15; b = -41; c = +14;
Δ = b2-4ac
Δ = -412-4·15·14
Δ = 841
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{841}=29$
$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-41)-29}{2*15}=\frac{12}{30}
=2/5
$
$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-41)+29}{2*15}=\frac{70}{30}
=2+1/3
$