A
d
d
a
n
d
f
i
n
d
t
h
e
d
e
g
r
e
e
o
f
t
h
e
f
o
l
l
o
w
i
n
g
e
x
p
r
e
s
s
i
o
n
:
(
9
x
+
3
y
)
a
n
d
(
10
x
-
9
y
)
Matching exercise
Match the items on the right to the items on the left.
Check
OK
STEP1
STEP2
STEP3
STEP4
STEP5
