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m in (-oo:+oo)
(-1/2)*m+5 = 25 // - 25
(-1/2)*m-25+5 = 0
-1/2*m-20 = 0 // + 20
-1/2*m = 20 // : -1/2
m = 20/(-1/2)
m = -40
m = -40
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