Explicație pas cu pas:
(x-10)÷4+13]x6+86=140
(x-10)÷4+13]x6=140 - 86
(x-10)÷4+13]x6= 54
(x-10)÷4+13]= 54:6
(x-10)÷4+13]= 9
(x-10)÷4= 9 -13
(x-10)÷4= -4
×-10=-4×4
×-10= -16
× = -16 +10
×= -6
