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m in (-oo:+oo)
(1/2)*(8*m-10) = 19 // - 19
(1/2)*(8*m-10)-19 = 0
1/2*(8*m-10)-19 = 0
1/2*(8*m-10)-19 = 0
4*m-24 = 0
4*m-24 = 0
4*m-24 = 0 // + 24
4*m = 24 // : 4
m = 24/4
m = 6
m = 6
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