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a in (-oo:+oo)
(-3*a)/5-((2*a)/6) = 14 // - 14
(-3*a)/5-((2*a)/6)-14 = 0
(-3*a)/5+(-1/3)*a-14 = 0
-14/15*a-14 = 0 // + 14
-14/15*a = 14 // : -14/15
a = 14/(-14/15)
a = -15
a = -15
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