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m in (-oo:+oo)
9 = (-3/4)*m // - (-3/4)*m
9-((-3/4)*m) = 0
(3/4)*m+9 = 0
3/4*m+9 = 0 // - 9
3/4*m = -9 // : 3/4
m = -9/3/4
m = -12
m = -12
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