a) 25 + 3 . ( x - 7 ) = 106
3 . ( x - 7 ) = 106 -25
3 . ( x - 7 ) = 81
( x - 7 ) = 81 : 3
x - 7 = 27
x = 27 + 7
x = 34
b) 32 . ( x + 4 ) - 52 = 5. 22
32 . ( x + 4 ) - 52 = 20
32 . ( x + 4 ) = 20 + 52
32 . ( x + 4 ) = 45
( x + 4 ) = 45 : 32
( x + 4 ) = 5
x = 5 - 4
x = 1
c) 4 . ( x - 3 ) = 72 - 110
4 . ( x - 3 ) = 48
( x - 3 ) = 48 : 4
x - 3 = 12
x = 12 + 3
x = 15
tk cho mk nha
a) 25 + 3 . ( x - 7 ) =106
3 . ( x - 7 ) = 106 - 25
3 . ( x -7 ) =81
x - 7 = 81 :3
x - 7 = 27
x = 27 - 7
x =20
b) 9 . ( x+ 4 ) - 25 = 5.4
9 . ( x + 4 ) - 25 = 20
9 . (x + 4 ) = 25 + 20
9 . ( x + 4 ) = 45
x + 4 = 45 :9
x +4 = 5
x = 5 -4
x = 1
c) 4. ( x - 3 ) = 49 -1
4 . ( x - 3 ) = 48
x - 3 = 48 : 4
x -3 =24
x = 24 + 3
x = 27