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m in (-oo:+oo)
m/(-4) = 4.2 // - 4.2
m/(-4)-4.2 = 0
-1/4*m-4.2 = 0 // + 4.2
-1/4*m = 4.2 // : -1/4
m = 4.2/(-1/4)
m = -16.8
m = -16.8
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