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m in (-oo:+oo)
4*m+4 = -5*m-77 // + -5*m-77
4*m-(-5*m)+4+77 = 0
4*m+5*m+4+77 = 0
9*m+81 = 0 // - 81
9*m = -81 // : 9
m = -81/9
m = -9
m = -9
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