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m in (-oo:+oo)
7*(7-7*m) = -49 // + 49
7*(7-7*m)+49 = 0
7*(7-7*m)+49 = 0
98-49*m = 0
98-49*m = 0
98-49*m = 0 // - 98
-49*m = -98 // : -49
m = -98/(-49)
m = 2
m = 2
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