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m in (-oo:+oo)
-8 = -(m/5)-4 // + -(m/5)-4
m/5-8+4 = 0
1/5*m-4 = 0 // + 4
1/5*m = 4 // : 1/5
m = 4/1/5
m = 20
m = 20
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