rozwiąz i sprawdz -9z-7=-z-6

-9z-7=-z-6 -9z+z=-6+7 -8z=1 /:-8 z=-⅛ spr -8*(-⅛)=1

-9z-7 = -z-6 -9z+z=-6+7 -8z=1/:(-8) z= - 1/8 spr : -9 * (-1/8) -7 = 1/8 -6 9/8 - 7 = -5 i 7/8 1 i 1/8 - 7 = -5 i 7/8 -5 i 7/8 = -5 i 7/8