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m in (-oo:+oo)
(-1/5)*m-10 = 10 // - 10
(-1/5)*m-10-10 = 0
-1/5*m-20 = 0 // + 20
-1/5*m = 20 // : -1/5
m = 20/(-1/5)
m = -100
m = -100
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