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m in (-oo:+oo)
(-2/9)*m-4 = 7/18 // - 7/18
(-2/9)*m-(7/18)-4 = 0
(-2/9)*m-7/18-4 = 0
-2/9*m-79/18 = 0 // + 79/18
-2/9*m = 79/18 // : -2/9
m = 79/18/(-2/9)
m = -79/4
m = -79/4
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