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m in (-oo:+oo)
7*m+6 = -5*m-30 // + -5*m-30
7*m-(-5*m)+6+30 = 0
7*m+5*m+6+30 = 0
12*m+36 = 0 // - 36
12*m = -36 // : 12
m = -36/12
m = -3
m = -3
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