X 15 0 3 1 5

X 2 +6x−15. X 15 0 3 1 5. X2-2x-15=0. X2-15=2x. X 15 0 3 1 5.
X 2 +6x−15. X 15 0 3 1 5. X2-2x-15=0. X2-15=2x. X 15 0 3 1 5.
X/3+x/2=15.
X/3+x/2=15.