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y in (-oo:+oo)
(9/10)*y-(7/10) = 7/5 // - 7/5
(9/10)*y-(7/10)-(7/5) = 0
(9/10)*y-7/10-7/5 = 0
9/10*y-21/10 = 0 // + 21/10
9/10*y = 21/10 // : 9/10
y = 21/10/9/10
y = 7/3
y = 7/3
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