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m in (-oo:+oo)
m+7*m-(7/10) = 793/10 // - 793/10
m+7*m-(7/10)-(793/10) = 0
m+7*m-7/10-793/10 = 0
8*m-80 = 0 // + 80
8*m = 80 // : 8
m = 80/8
m = 10
m = 10
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