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m in (-oo:+oo)
3*m+9/10 = 7/30 // - 7/30
3*m+9/10-(7/30) = 0
3*m+9/10-7/30 = 0
3*m+2/3 = 0 // - 2/3
3*m = -2/3 // : 3
m = -2/3/3
m = -2/9
m = -2/9
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