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y in (-oo:+oo)
(7/5)*y = 3/10 // - 3/10
(7/5)*y-(3/10) = 0
(7/5)*y-3/10 = 0
7/5*y-3/10 = 0 // + 3/10
7/5*y = 3/10 // : 7/5
y = 3/10/7/5
y = 3/14
y = 3/14
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