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m in (-oo:+oo)
2*(7*m+6) = -156 // + 156
2*(7*m+6)+156 = 0
2*(7*m+6)+156 = 0
14*m+168 = 0
14*m+168 = 0
14*m+168 = 0 // - 168
14*m = -168 // : 14
m = -168/14
m = -12
m = -12
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