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m in (-oo:+oo)
(1/2)*(m+245) = 300 // - 300
(1/2)*(m+245)-300 = 0
1/2*(m+245)-300 = 0
1/2*(m+245)-300 = 0
1/2*m-355/2 = 0
1/2*m-355/2 = 0
1/2*m-355/2 = 0 // + 355/2
1/2*m = 355/2 // : 1/2
m = 355/2/1/2
m = 355
m = 355
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