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d in (-oo:+oo)
(1/2)*(d+450) = 300 // - 300
(1/2)*(d+450)-300 = 0
1/2*(d+450)-300 = 0
1/2*(d+450)-300 = 0
1/2*d-75 = 0
1/2*d-75 = 0
1/2*d-75 = 0 // + 75
1/2*d = 75 // : 1/2
d = 75/1/2
d = 150
d = 150
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