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m in (-oo:+oo)
3*m-(2/5) = 7-10 // - 7-10
3*m-(2/5)-7+10 = 0
3*m-2/5-7+10 = 0
3*m+13/5 = 0 // - 13/5
3*m = -13/5 // : 3
m = -13/5/3
m = -13/15
m = -13/15
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