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m in (-oo:+oo)
5*(4*m+4) = -200 // + 200
5*(4*m+4)+200 = 0
5*(4*m+4)+200 = 0
20*m+220 = 0
20*m+220 = 0
20*m+220 = 0 // - 220
20*m = -220 // : 20
m = -220/20
m = -11
m = -11
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