Simplify the expression by combining like terms.
15+12−5+4−7
15
+
12
x
-
5
x
+
4
y
-
7

CLEAR CHECK

11+8
11
x
y
+
8

7+4+8
7
x
+
4
y
+
8

7+4−7
7
x
+
4
y
-
7

15+11−7