A)= . Use the quadratic formula = = = = .
Unfortunately, you failed to use parentheses properly, so your writing is ambiguous. I read it like this and I am not responsible if it is wrong. The responsible side are you. B)= . Multiply both sides by (5*4*3*x) = 60x, which is the common denominator. You will get 12 - 15 + 20 = -17x. Now solve it yourself.