3a(a-5)+4-2a=4

Solution for 3a(a-5)+4-2a=4 equation:

3a(a-5)+4-2a=4

We move all terms to the left:

3a(a-5)+4-2a-(4)=0

We add all the numbers together, and all the variables

-2a+3a(a-5)=0

We multiply parentheses

3a^2-2a-15a=0

We add all the numbers together, and all the variables

3a^2-17a=0

a = 3; b = -17; c = 0;
Δ = b2-4ac
Δ = -172-4·3·0
Δ = 289
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{289}=17$
$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-17)-17}{2*3}=\frac{0}{6}
=0
$
$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-17)+17}{2*3}=\frac{34}{6}
=5+2/3
$