Найду корень уравнения: 8-5(8+3х)=13+х
8 - 5*(8 + 3*x) = 13 + x
8-5*(8+3*x) = 13+x
8-5*8-5*3*x = 13+x
-32 - 15*x = 13+x
x = 45 / (-16)
-45 x1 = ---- 16
x1 = -2.8125