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m in (-oo:+oo)
9 = 4*m-3*m+7 // - 4*m-3*m+7
9-(-3*m)-(4*m)-7 = 0
3*m-4*m-7+9 = 0
2-m = 0 // - 2
-m = -2 // * -1
m = 2
m = 2
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