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m in (-oo:+oo)
7*m+4 = 89/10 // - 89/10
7*m-(89/10)+4 = 0
7*m-89/10+4 = 0
7*m-49/10 = 0 // + 49/10
7*m = 49/10 // : 7
m = 49/10/7
m = 7/10
m = 7/10
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