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m in (-oo:+oo)
4*m-(7/2) = 2*18 // - 2*18
4*m-(7/2)-(2*18) = 0
4*m-7/2-36 = 0
4*m-79/2 = 0 // + 79/2
4*m = 79/2 // : 4
m = 79/2/4
m = 79/8
m = 79/8
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