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b in (-oo:+oo)
16250 = 65*(1/2)*(b+220) // - 65*(1/2)*(b+220)
16250-(65*(1/2)*(b+220)) = 0
(-65/2)*(b+220)+16250 = 0
16250-65/2*(b+220) = 0
16250-65/2*(b+220) = 0
9100-65/2*b = 0
9100-65/2*b = 0
9100-65/2*b = 0 // - 9100
-65/2*b = -9100 // : -65/2
b = -9100/(-65/2)
b = 280
b = 280
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