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m in (-oo:+oo)
2*(8-m) = 36 // - 36
2*(8-m)-36 = 0
2*(8-m)-36 = 0
-2*m-20 = 0
-2*m-20 = 0
-2*m-20 = 0 // + 20
-2*m = 20 // : -2
m = 20/(-2)
m = -10
m = -10
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