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a in (-oo:+oo)
17 = (7/3)*a // - (7/3)*a
17-((7/3)*a) = 0
(-7/3)*a+17 = 0
17-7/3*a = 0 // - 17
-7/3*a = -17 // : -7/3
a = -17/(-7/3)
a = 51/7
a = 51/7
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