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y in (-oo:+oo)
(1/2)*(100-y-y) = 40 // - 40
(1/2)*(100-y-y)-40 = 0
1/2*(100-2*y)-40 = 0
1/2*(100-2*y)-40 = 0
10-y = 0
10-y = 0
10-y = 0 // - 10
-y = -10 // * -1
y = 10
y = 10
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