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y in (-oo:+oo)
(9/10)*y-(7/10) = 9/5 // - 9/5
(9/10)*y-(7/10)-(9/5) = 0
(9/10)*y-7/10-9/5 = 0
9/10*y-5/2 = 0 // + 5/2
9/10*y = 5/2 // : 9/10
y = 5/2/9/10
y = 25/9
y = 25/9
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