solve for x3/4 = 5x
x in (-oo:+oo)3/4 = 5x // - 5x3/4-(5x) = 03/4-5x = 03/4-5x = 0 // - 3/4-5x = -3/4 // : -5x = -3/4/(-5)x = 3/20x = 3/20