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m in (-oo:+oo)
3*m+1 = -4*m-6 // + -4*m-6
3*m-(-4*m)+1+6 = 0
3*m+4*m+1+6 = 0
7*m+7 = 0 // - 7
7*m = -7 // : 7
m = -7/7
m = -1
m = -1
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