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m in (-oo:+oo)
2/5 = -20*m // + -20*m
2/5-(-20*m) = 0
20*m+2/5 = 0
20*m+2/5 = 0 // - 2/5
20*m = -2/5 // : 20
m = -2/5/20
m = -1/50
m = -1/50
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