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y in (-oo:+oo)
9*y-(4/5) = 6 // - 6
9*y-(4/5)-6 = 0
9*y-4/5-6 = 0
9*y-34/5 = 0 // + 34/5
9*y = 34/5 // : 9
y = 34/5/9
y = 34/45
y = 34/45
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