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y in (-oo:+oo)
5*y = 15*(-1/5)+2 // - 15*(-1/5)+2
5*y-(15*(-1/5))-2 = 0
5*y-2+3 = 0
5*y+1 = 0 // - 1
5*y = -1 // : 5
y = -1/5
y = -1/5
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