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m in (-oo:+oo)
7*m+3/8 = -165/8 // + -165/8
7*m+3/8-(-165/8) = 0
7*m+3/8+165/8 = 0
7*m+21 = 0 // - 21
7*m = -21 // : 7
m = -21/7
m = -3
m = -3
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