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a in (-oo:+oo)
(4/5)*a+6 = (9/10)*a // - (9/10)*a
(4/5)*a-((9/10)*a)+6 = 0
(4/5)*a+(-9/10)*a+6 = 0
6-1/10*a = 0 // - 6
-1/10*a = -6 // : -1/10
a = -6/(-1/10)
a = 60
a = 60
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