If a : b = 8 : 5, find (7a + 5b) : (8a − 9b).
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If 3A = 5B = 6C, find A : B : C.
If x : y = 3 : 2, find (5x − 3y) : (7x + 2y).
If x : y = 10 : 3, find (3x2 + 2y2) : (3x2 − 2y2).