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m in (-oo:+oo)
(-3/10)*m = -2/3 // + -2/3
(-3/10)*m-(-2/3) = 0
(-3/10)*m+2/3 = 0
2/3-3/10*m = 0 // - 2/3
-3/10*m = -2/3 // : -3/10
m = -2/3/(-3/10)
m = 20/9
m = 20/9
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