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a in (-oo:+oo)
(1/2)*a = (3/5)*a-5 // - (3/5)*a-5
(1/2)*a-((3/5)*a)+5 = 0
(1/2)*a+(-3/5)*a+5 = 0
5-1/10*a = 0 // - 5
-1/10*a = -5 // : -1/10
a = -5/(-1/10)
a = 50
a = 50
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