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m in (-oo:+oo)
2*(m-9) = -10 // + 10
2*(m-9)+10 = 0
2*(m-9)+10 = 0
2*m-8 = 0
2*m-8 = 0
2*m-8 = 0 // + 8
2*m = 8 // : 2
m = 8/2
m = 4
m = 4
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