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a in (-oo:+oo)
(7/10)*a = 3/5 // - 3/5
(7/10)*a-(3/5) = 0
(7/10)*a-3/5 = 0
7/10*a-3/5 = 0 // + 3/5
7/10*a = 3/5 // : 7/10
a = 3/5/7/10
a = 6/7
a = 6/7
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