The answer is below

multiply both sides by dx

integrate both sides of the diffrential

simplify and integrate to get y alone don't forget to tack on c with your indefinite integral
What we know is that the sum of a triangle's internal angles are 180º, and a straight angle makes 180º.
first, we have to find the third internal angle(let's call it n) so that we can use it to find the exterior angle.
(3x + 20) + (4x + 5) + n = 180
simplify:
7x + 25 + n = 180
7x + n = 155
n = 155 - 7x
Now we can add it to the external angle to find x.
(155 - 7x) + (8x + 15) = 180
simplify:
170 + 8x - 7x = 180
170 + x = 180
x = 10
Now we can substitute it to the external angle.
8 x 10 + 15 = 95
the exterior angle is 95º.
It’s wrong because you put the x and the 3 in parentheses when it’s wrong there
120 - 80 (Futbol) - 20 (voley) = 20 - 10 (Futbol y Voley) = 10
10 Personas mas juegan Voley
Pero si estas diciendo Cuantos Juegan Voley en total, eso sera
30 Personas