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m in (-oo:+oo)
(5*5*m)/8 = 2*m+10.5 // - 2*m+10.5
(5*5*m)/8-(2*m)-10.5 = 0
(5*5*m)/8-2*m-10.5 = 0
9/8*m-10.5 = 0 // + 10.5
9/8*m = 10.5 // : 9/8
m = 10.5/9/8
m = 9.33333333
m = 9.33333333
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