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m in (-oo:+oo)
(-5/9)*m = -1/2 // + -1/2
(-5/9)*m-(-1/2) = 0
(-5/9)*m+1/2 = 0
1/2-5/9*m = 0 // - 1/2
-5/9*m = -1/2 // : -5/9
m = -1/2/(-5/9)
m = 9/10
m = 9/10
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