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m in (-oo:+oo)
16 = (4/7)*m // - (4/7)*m
16-((4/7)*m) = 0
(-4/7)*m+16 = 0
16-4/7*m = 0 // - 16
-4/7*m = -16 // : -4/7
m = -16/(-4/7)
m = 28
m = 28
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