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m in (-oo:+oo)
4*(m/2-9) = 40 // - 40
4*(m/2-9)-40 = 0
4*(1/2*m-9)-40 = 0
4*(1/2*m-9)-40 = 0
2*m-76 = 0
2*m-76 = 0
2*m-76 = 0 // + 76
2*m = 76 // : 2
m = 76/2
m = 38
m = 38
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