1/(x*x-2x-3)+2/(x*-x-6)+3/(x*x+3x+2)=0

1/(x*x-2x-3)+2/(x*-x-6)+3/(x*x+3x+2)=0


1 / (x * x-2x-3) + 2 / (x * x-x-6) + 3 / (x * x + 3x + 2) = 1 / (x-3) * (x + 1) + 2 / (x-3) * (x + 2) + 3 / (x + 1) * (x + 2) = [(x + 2) + 2 (x + 1) + 3 (x-3)] / (x + 1) (x + 2) (x-3) = (6x-5) / (x + 1) (x + 2) (x-3) because the denominator cannot be zero, so 6x-5 = 0, x = 5 / 6



0.4x plus 0.3x equals 18.9, find X


0.4x+0.3x=18.9 ==》0.7x=18.9 ==》x=18.9/0.7=27