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m in (-oo:+oo)
(-4/5)*m+1/2 = -7/2 // + -7/2
(-4/5)*m+1/2-(-7/2) = 0
(-4/5)*m+1/2+7/2 = 0
4-4/5*m = 0 // - 4
-4/5*m = -4 // : -4/5
m = -4/(-4/5)
m = 5
m = 5
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