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m in (-oo:+oo)
3*m+3/7 = -51/28 // + -51/28
3*m+3/7-(-51/28) = 0
3*m+3/7+51/28 = 0
3*m+9/4 = 0 // - 9/4
3*m = -9/4 // : 3
m = -9/4/3
m = -3/4
m = -3/4
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