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m in (-oo:+oo)
6*(6-(7*m)) = -132 // + 132
6*(6-(7*m))+132 = 0
6*(6-7*m)+132 = 0
6*(6-7*m)+132 = 0
168-42*m = 0
168-42*m = 0
168-42*m = 0 // - 168
-42*m = -168 // : -42
m = -168/(-42)
m = 4
m = 4
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