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a in (-oo:+oo)
7/5-((27*a)/4) = -((7*a)/4-(2/5)) // + (7*a)/4-(2/5)
(7*a)/4-((27*a)/4)+7/5-(2/5) = 0
(-27/4)*a+(7*a)/4+7/5-2/5 = 0
1-5*a = 0 // - 1
-5*a = -1 // : -5
a = -1/(-5)
a = 1/5
a = 1/5
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