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m in (-oo:+oo)
(4*m-7)/2 = 18 // - 18
(4*m-7)/2-18 = 0
(4*m-7)/2+(-18*2)/2 = 0
4*m-18*2-7 = 0
4*m-43 = 0
(4*m-43)/2 = 0
(4*m-43)/2 = 0 // * 2
4*m-43 = 0
4*m-43 = 0 // + 43
4*m = 43 // : 4
m = 43/4
m = 43/4
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