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y in (-oo:+oo)
1/2-((3/5)*y) = 8 // - 8
1/2-((3/5)*y)-8 = 0
(-3/5)*y+1/2-8 = 0
-3/5*y-15/2 = 0 // + 15/2
-3/5*y = 15/2 // : -3/5
y = 15/2/(-3/5)
y = -25/2
y = -25/2
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