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m in (-oo:+oo)
(21/4)*m+3 = 41/8 // - 41/8
(21/4)*m-(41/8)+3 = 0
(21/4)*m-41/8+3 = 0
21/4*m-17/8 = 0 // + 17/8
21/4*m = 17/8 // : 21/4
m = 17/8/21/4
m = 17/42
m = 17/42
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