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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+4 = 0
2*m+4 = 0
2*m+4 = 0 // - 4
2*m = -4 // : 2
m = -4/2
m = -2
m = -2
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