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m in (-oo:+oo)
(-3/4)*m = -20 // + 20
(-3/4)*m+20 = 0
20-3/4*m = 0 // - 20
-3/4*m = -20 // : -3/4
m = -20/(-3/4)
m = 80/3
m = 80/3
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