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m in (-oo:+oo)
5*m-6 = -3*m-78 // + -3*m-78
5*m-(-3*m)-6+78 = 0
5*m+3*m-6+78 = 0
8*m+72 = 0 // - 72
8*m = -72 // : 8
m = -72/8
m = -9
m = -9
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