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m in (-oo:+oo)
2*(7*m+1) = -40 // + 40
2*(7*m+1)+40 = 0
2*(7*m+1)+40 = 0
14*m+42 = 0
14*m+42 = 0
14*m+42 = 0 // - 42
14*m = -42 // : 14
m = -42/14
m = -3
m = -3
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