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a in (-oo:+oo)
(1/4)*a = 4/15 // - 4/15
(1/4)*a-(4/15) = 0
(1/4)*a-4/15 = 0
1/4*a-4/15 = 0 // + 4/15
1/4*a = 4/15 // : 1/4
a = 4/15/1/4
a = 16/15
a = 16/15
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