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m in (-oo:+oo)
3*m+7 = 53/8 // - 53/8
3*m-(53/8)+7 = 0
3*m-53/8+7 = 0
3*m+3/8 = 0 // - 3/8
3*m = -3/8 // : 3
m = -3/8/3
m = -1/8
m = -1/8
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