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Mathematics
Mathematics
Problem
If
y
y
y
is a real number, find
324
y
2
+
36
y
(
21
−
18
y
)
+
(
21
−
18
y
)
2
324y^2 + 36y(21 - 18y) + (21 - 18y)^2
324
y
2
+
36
y
(
21
−
18
y
)
+
(
21
−
18
y
)
2
.
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