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y in (-oo:+oo)
((1/2)*y-50)*((3/5)*y+10) = 0
(1/2*y-50)*(3/5*y+10) = 0
( 1/2*y-50 )
1/2*y-50 = 0 // + 50
1/2*y = 50 // : 1/2
y = 50/1/2
y = 100
( 3/5*y+10 )
3/5*y+10 = 0 // - 10
3/5*y = -10 // : 3/5
y = -10/3/5
y = -50/3
y in { 100, -50/3 }
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