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m in (-oo:+oo)
29 = (-4/7)*m+5 // - (-4/7)*m+5
29-((-4/7)*m)-5 = 0
(4/7)*m-5+29 = 0
4/7*m+24 = 0 // - 24
4/7*m = -24 // : 4/7
m = -24/4/7
m = -42
m = -42
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