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m in (-oo:+oo)
(-3/4)*m+3 = 8 // - 8
(-3/4)*m-8+3 = 0
-3/4*m-5 = 0 // + 5
-3/4*m = 5 // : -3/4
m = 5/(-3/4)
m = -20/3
m = -20/3
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