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m in (-oo:+oo)
(1/2)*m+2/5 = 10 // - 10
(1/2)*m+2/5-10 = 0
1/2*m-48/5 = 0 // + 48/5
1/2*m = 48/5 // : 1/2
m = 48/5/1/2
m = 96/5
m = 96/5
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