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m in (-oo:+oo)
-m-7 = 6*m-35 // - 6*m-35
35-m-(6*m)-7 = 0
35-m-6*m-7 = 0
28-7*m = 0 // - 28
-7*m = -28 // : -7
m = -28/(-7)
m = 4
m = 4
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