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m in (-oo:+oo)
(1/2)*m-2 = -17/10 // + -17/10
(1/2)*m-(-17/10)-2 = 0
(1/2)*m+17/10-2 = 0
1/2*m-3/10 = 0 // + 3/10
1/2*m = 3/10 // : 1/2
m = 3/10/1/2
m = 3/5
m = 3/5
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