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y in (-oo:+oo)
(3/5)*y+5 = 7 // - 7
(3/5)*y-7+5 = 0
3/5*y-2 = 0 // + 2
3/5*y = 2 // : 3/5
y = 2/3/5
y = 10/3
y = 10/3
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