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Answer:
Combined equation is 
Step-by-step explanation:
a varies directly as b and inversely as c.
This can be written as
a =
a = kb
where k is the proportionality constant
-------------------------------------(1)
Now lets find the k value bu substituting the given a, b,c values


36 = 12 k

k = 3
Thus the eq(1) becomes

Let us now find the value of a when b=7 and c = 3


a = 7
X=22. The supplementary angle is 90°, so the 66° angle, plus (x+2) has to add up to 90° too.