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m in (-oo:+oo)
(-1/7)*m-(1/10) = -27/70 // + -27/70
(-1/7)*m-(1/10)-(-27/70) = 0
(-1/7)*m-1/10+27/70 = 0
2/7-1/7*m = 0 // - 2/7
-1/7*m = -2/7 // : -1/7
m = -2/7/(-1/7)
m = 2
m = 2
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