Which equation could be used to solve problems involving the relationships between the angles?
A) (12 + a) + (7a + 12) = 90
B) 90 + (12 + a) = (7a + 12)
C) (12 + a) - (7a + 12) = 90
D) (7a + 12) - 90 = (12 + a)
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