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m in (-oo:+oo)
(-1/5)*m+3/8 = 19/8 // - 19/8
(-1/5)*m+3/8-(19/8) = 0
(-1/5)*m+3/8-19/8 = 0
-1/5*m-2 = 0 // + 2
-1/5*m = 2 // : -1/5
m = 2/(-1/5)
m = -10
m = -10
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