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a in (-oo:+oo)
-23/4 = 10-a-((3/4)*a) // - 10-a-((3/4)*a)
a+(3/4)*a-23/4-10 = 0
7/4*a-63/4 = 0 // + 63/4
7/4*a = 63/4 // : 7/4
a = 63/4/7/4
a = 9
a = 9
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