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y in (-oo:+oo)
(8/7)*y = 3/10 // - 3/10
(8/7)*y-(3/10) = 0
(8/7)*y-3/10 = 0
8/7*y-3/10 = 0 // + 3/10
8/7*y = 3/10 // : 8/7
y = 3/10/8/7
y = 21/80
y = 21/80
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