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m in (-oo:+oo)
(-4/7)*m+2/9 = -16/63 // + -16/63
(-4/7)*m+2/9-(-16/63) = 0
(-4/7)*m+2/9+16/63 = 0
10/21-4/7*m = 0 // - 10/21
-4/7*m = -10/21 // : -4/7
m = -10/21/(-4/7)
m = 5/6
m = 5/6
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