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m in (-oo:+oo)
9/10-4*m = m+209/10 // - m+209/10
9/10-4*m-m-(209/10) = 0
9/10-4*m-m-209/10 = 0
-5*m-20 = 0 // + 20
-5*m = 20 // : -5
m = 20/(-5)
m = -4
m = -4
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