(1)x+
x=
(2)
x-6×
=2
(3)
x+0.3x=16 (4)x-
x=20
(1)x+
x=
x=
x=
(2)
x-6×
=2
x-4=2
x=18
(3)
x+0.3x=16
0.8x=16
x=20 (4)x-
x=20
x=20
x=25
(1)x+
x=
(2)
x-6×
=2
(3)
x+0.3x=16 (4)x-
x=20
(1)x+
x=
x=
x=
(2)
x-6×
=2
x-4=2
x=18
(3)
x+0.3x=16
0.8x=16
x=20 (4)x-
x=20
x=20
x=25