basia: log4 (x+3) - log4 (x-1)= 2- log4 8

konopka: log₄ (x+3)-log₄ (x-1) = 2-log₄ 8 log₄ {(x+3)/(x-1)] = log₄ 16 - log₄ 8 log₄ [(x+3)/(x-1)] = log₄ (16/8) log₄[(x+3)/(x-1)] = log₄ 2 (x+3)/(x-1) = 2 (x+3) = 2(x-1) x+3= 2x - 2 x = 5