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Let's simplify step-by-step.
3
x
+
5
y

x
+
4
y
=
3
x
+
5
y
+

x
+
4
y
Combine Like Terms:
=
3
x
+
5
y
+

x
+
4
y
=
(
3
x
+

x
)
+
(
5
y
+
4
y
)
=
2
x
+
9
y