Find an equation that has the given solutions. (Assume the equation has a degree of 2.)

a=-1/3, a=3/7

x = -1/3

x + 1/3 = 0

x = 3/7
x - 3/7 = 0

(x+1/3)(x-3/7) = 0
x^2 - 3x/7 + x/3 - 1/7 = 0
Multiply by 21:
21x^2 -9x + 7x - 3 = 0
21x^2 - 2x - 3 = 0