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m in (-oo:+oo)
4*m+3/10 = -11/30 // + -11/30
4*m+3/10-(-11/30) = 0
4*m+3/10+11/30 = 0
4*m+2/3 = 0 // - 2/3
4*m = -2/3 // : 4
m = -2/3/4
m = -1/6
m = -1/6
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