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m in (-oo:+oo)
-15 = (3/4)*m+18 // - (3/4)*m+18
-((3/4)*m)-18-15 = 0
(-3/4)*m-18-15 = 0
-3/4*m-33 = 0 // + 33
-3/4*m = 33 // : -3/4
m = 33/(-3/4)
m = -44
m = -44
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