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m in (-oo:+oo)
-2.5 = (-1/3)*m+3/5 // - (-1/3)*m+3/5
-((-1/3)*m)-(3/5)-2.5 = 0
(1/3)*m-3/5-2.5 = 0
1/3*m-3.1 = 0 // + 3.1
1/3*m = 3.1 // : 1/3
m = 3.1/1/3
m = 9.30000009
m = 9.30000009
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