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y in (-oo:+oo)
(9/10)*y-(3/10) = 7/5 // - 7/5
(9/10)*y-(3/10)-(7/5) = 0
(9/10)*y-3/10-7/5 = 0
9/10*y-17/10 = 0 // + 17/10
9/10*y = 17/10 // : 9/10
y = 17/10/9/10
y = 17/9
y = 17/9
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