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m in (-oo:+oo)
(1/2)*m+6.3 = 9.8 // - 9.8
(1/2)*m-9.8+6.3 = 0
1/2*m-3.5 = 0 // + 3.5
1/2*m = 3.5 // : 1/2
m = 3.5/1/2
m = 7
m = 7
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