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m in (-oo:+oo)
2/3 = -m/10 // + -m/10
2/3-(-m/10) = 0
(1/10)*m+2/3 = 0
1/10*m+2/3 = 0 // - 2/3
1/10*m = -2/3 // : 1/10
m = -2/3/1/10
m = -20/3
m = -20/3
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