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a in (-oo:+oo)
-6 = (3/5)*a // - (3/5)*a
-((3/5)*a)-6 = 0
(-3/5)*a-6 = 0
-3/5*a-6 = 0 // + 6
-3/5*a = 6 // : -3/5
a = 6/(-3/5)
a = -10
a = -10
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