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m in (-oo:+oo)
(1/2)*m+9/10 = 69/10 // - 69/10
(1/2)*m+9/10-(69/10) = 0
(1/2)*m+9/10-69/10 = 0
1/2*m-6 = 0 // + 6
1/2*m = 6 // : 1/2
m = 6/1/2
m = 12
m = 12
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