(1)x-
x=24 1 4
x=243 4
x×3 4
=24×4 3
4 3
x=32;
(2)4x+
x=91 2
4.5x=9
4.5x÷4.5=9÷4.5
x=2;
(3)
+2x=5 9
2 3
+2x-5 9
=5 9
-2 3
5 9
2x=
1 9
2x÷2=
÷21 9
x=
;1 18
(4)
x-5 8
=3 5
2 5
x-5 8
+3 5
=3 5
+2 5
3 5
x=15 8
x×5 8
=1×8 5
8 5
x=
.8 5