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y in (-oo:+oo)
(1/5)*(9*y+8)-12 = 4 // - 4
(1/5)*(9*y+8)-12-4 = 0
1/5*(9*y+8)-12-4 = 0
1/5*(9*y+8)-12-4 = 0
9/5*y-52/5-4 = 0
9/5*y-72/5 = 0
9/5*y-72/5 = 0
9/5*y-72/5 = 0 // + 72/5
9/5*y = 72/5 // : 9/5
y = 72/5/9/5
y = 8
y = 8
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