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a in (-oo:+oo)
a/15+3/5 = 4/15 // - 4/15
a/15+3/5-(4/15) = 0
a/15+3/5-4/15 = 0
1/15*a+1/3 = 0 // - 1/3
1/15*a = -1/3 // : 1/15
a = -1/3/1/15
a = -5
a = -5
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