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y in (-oo:+oo)
-((3*y)/5) = 15 // - 15
-((3*y)/5)-15 = 0
(-3/5)*y-15 = 0
-3/5*y-15 = 0 // + 15
-3/5*y = 15 // : -3/5
y = 15/(-3/5)
y = -25
y = -25
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