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y in (-oo:+oo)
15*y = 5*(1/5)-4 // - 5*(1/5)-4
15*y-(5*(1/5))+4 = 0
15*y-1+4 = 0
15*y+3 = 0 // - 3
15*y = -3 // : 15
y = -3/15
y = -1/5
y = -1/5
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