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y in (-oo:+oo)
15*y = 10*(-1/5)-1 // - 10*(-1/5)-1
15*y-(10*(-1/5))+1 = 0
15*y+1+2 = 0
15*y+3 = 0 // - 3
15*y = -3 // : 15
y = -3/15
y = -1/5
y = -1/5
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