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m in (-oo:+oo)
5*(3-7*m) = -160 // + 160
5*(3-7*m)+160 = 0
5*(3-7*m)+160 = 0
175-35*m = 0
175-35*m = 0
175-35*m = 0 // - 175
-35*m = -175 // : -35
m = -175/(-35)
m = 5
m = 5
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