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m in (-oo:+oo)
25 = 7*m-(2/3) // - 7*m-(2/3)
2/3-(7*m)+25 = 0
2/3-7*m+25 = 0
77/3-7*m = 0 // - 77/3
-7*m = -77/3 // : -7
m = -77/3/(-7)
m = 11/3
m = 11/3
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