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a in (-oo:+oo)
(14/15)*a = (1/15)*a+2/5 // - (1/15)*a+2/5
(14/15)*a-((1/15)*a)-(2/5) = 0
(14/15)*a+(-1/15)*a-2/5 = 0
13/15*a-2/5 = 0 // + 2/5
13/15*a = 2/5 // : 13/15
a = 2/5/13/15
a = 6/13
a = 6/13
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