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a in (-oo:+oo)
(1/10)*a-(4/5) = (9/2)*a+5/2 // - (9/2)*a+5/2
(1/10)*a-((9/2)*a)-(4/5)-(5/2) = 0
(1/10)*a+(-9/2)*a-4/5-5/2 = 0
-22/5*a-33/10 = 0 // + 33/10
-22/5*a = 33/10 // : -22/5
a = 33/10/(-22/5)
a = -3/4
a = -3/4
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