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m in (-oo:+oo)
(4/7)*m-2 = -88/35 // + -88/35
(4/7)*m-(-88/35)-2 = 0
(4/7)*m+88/35-2 = 0
4/7*m+18/35 = 0 // - 18/35
4/7*m = -18/35 // : 4/7
m = -18/35/4/7
m = -9/10
m = -9/10
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