If (7x + 5)^@ and (x +5)^@ are complemen...

If `(7x + 5)^@` and `(x +5)^@` are complementary angles, then find value of x. Options are (a) 10 (b) 20 (c) 30 (d) 40.

A

10

B

20

C

30

D

40

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