Question 167448
(3x+1)(x-1)= -3x

Start by multiplying both factors on the left side using FOIL.

3x^2 - 3x + x - 1 = -3x

3x^2 -2x - 1 + 3x = 0

3x^2 + x - 1 = 0

Use the quadratic formula to factor and find x.

Can you take it from here?