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m in (-oo:+oo)
6*m-10 = 86-2*m // - 86-2*m
6*m-(-2*m)-86-10 = 0
6*m+2*m-86-10 = 0
8*m-96 = 0 // + 96
8*m = 96 // : 8
m = 96/8
m = 12
m = 12
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