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m in (-oo:+oo)
7 = 8-(m/4.5) // - 8-(m/4.5)
m/4.5-8+7 = 0
0.22222222*m-1 = 0 // + 1
0.22222222*m = 1 // : 0.22222222
m = 1/0.22222222
m = 4.50000005
m = 4.50000005
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