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m in (-oo:+oo)
(1/5)*m+6.3 = 9.8 // - 9.8
(1/5)*m-9.8+6.3 = 0
1/5*m-3.5 = 0 // + 3.5
1/5*m = 3.5 // : 1/5
m = 3.5/1/5
m = 17.5
m = 17.5
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