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m in (-oo:+oo)
4*m-(2*m)-8 = -28 // + 28
4*m-(2*m)-8+28 = 0
4*m-2*m-8+28 = 0
2*m+20 = 0 // - 20
2*m = -20 // : 2
m = -20/2
m = -10
m = -10
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