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m in (-oo:+oo)
3*(7*m+7) = -63 // + 63
3*(7*m+7)+63 = 0
3*(7*m+7)+63 = 0
21*m+84 = 0
21*m+84 = 0
21*m+84 = 0 // - 84
21*m = -84 // : 21
m = -84/21
m = -4
m = -4
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