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m in (-oo:+oo)
-84 = -6*m-(2*m)-4 // + -6*m-(2*m)-4
2*m-(-6*m)-84+4 = 0
6*m+2*m-84+4 = 0
8*m-80 = 0 // + 80
8*m = 80 // : 8
m = 80/8
m = 10
m = 10
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