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m in (-oo:+oo)
25/36 = m+4/9 // - m+4/9
25/36-m-(4/9) = 0
25/36-m-4/9 = 0
1/4-m = 0 // - 1/4
-m = -1/4 // * -1
m = 1/4
m = 1/4
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