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m in (-oo:+oo)
4*(9-7*m) = 8 // - 8
4*(9-7*m)-8 = 0
4*(9-7*m)-8 = 0
28-28*m = 0
28-28*m = 0
28-28*m = 0 // - 28
-28*m = -28 // : -28
m = -28/(-28)
m = 1
m = 1
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