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a in (-oo:+oo)
9*a-(3/4) = 15 // - 15
9*a-(3/4)-15 = 0
9*a-3/4-15 = 0
9*a-63/4 = 0 // + 63/4
9*a = 63/4 // : 9
a = 63/4/9
a = 7/4
a = 7/4
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