X
+
5
=
12
X
=
____________________
X
+
3
=
5
X
=
____________________
X
-
2
=
12
X
=
____________________
10
=
X
-
6
X
=
____________________
2x
+
4
=
8
X
=
____________________
X
+
8
=
20
X
=
____________________
2x
-
3
=
5
X
=
____________________
5x
=
30
X
=
____________________
12x
+
12
=
72
X
=
____________________
X
+
14
=
17
X
=
____________________
13x
-
13
=
169
X
=
____________________
