[(10-x).2+5]:3-2=3
[(10-x).2+5]:3=3+2
[(10-x).2+5]:3=5
[(10-x).2+5]=5.3
[(10-x).2+5]=15
(10-x).2=15-5
(10-x).2=10
(10-x)=10:2
(10-x)=5
x=10-5
x=5
vậy x=5
[(10 - x) . 2 + 5] : 3 - 2 = 3
[(10 - x) . 2 + 5] : 3 = 3 + 2
[(10 - x) . 2 + 5] : 3 = 5
(10 - x) . 2 + 5 = 5 x 3
(10 - x) . 2 + 5 = 15
(10 - x) . 2 = 15 - 5
(10 - x) . 2 = 10
10 - x = 10 : 2
10 - x = 5
x = 10 - 5
x = 5
Vậy x = 5
[ ( 10 - x ) . 2+5 ] : 3 -2 =3
[ (10 - x) . 2+5] :3 =3+2
[ (10 - x) . 2+5] :3 =5
[ (10 - x) . 2+5] =5x3
(10 - x) . 2+5= 15
(10 - x) . 2 = 15-5
(10 - x) . 2 = 10
10 - x = 10 :2
10 - x = 5
x = 10 - 5
x = 5