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m in (-oo:+oo)
(-3*m)/4+5 = 30 // - 30
(-3*m)/4-30+5 = 0
-3/4*m-25 = 0 // + 25
-3/4*m = 25 // : -3/4
m = 25/(-3/4)
m = -100/3
m = -100/3
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