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m in (-oo:+oo)
(-1/2)*m-4 = -87/20 // + -87/20
(-1/2)*m-(-87/20)-4 = 0
(-1/2)*m+87/20-4 = 0
7/20-1/2*m = 0 // - 7/20
-1/2*m = -7/20 // : -1/2
m = -7/20/(-1/2)
m = 7/10
m = 7/10
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