akitsuilersorneq: 
ax^3+bx^2+cx+d=0
 peelersorneq: 3, -2
a≠0
(b+c)/a = (3*3*a+3*2*a+(-2)*(-2)*a+(-2)*3*a)/a = (9a+6a+4a-6a)/a = 13/1 = 13
(b+c)/a = -7, (b+c)/a = -7, 
35a + 5b + 5c = 0, 
b+c = -7a 
ilinniartitsisut: 
-7