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m in (-oo:+oo)
(-2/3)*m-2 = -10/7 // + -10/7
(-2/3)*m-(-10/7)-2 = 0
(-2/3)*m+10/7-2 = 0
-2/3*m-4/7 = 0 // + 4/7
-2/3*m = 4/7 // : -2/3
m = 4/7/(-2/3)
m = -6/7
m = -6/7
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