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m in (-oo:+oo)
(1/20)*m-(7/5)-7 = 0
(1/20)*m-7/5-7 = 0
1/20*m-42/5 = 0 // + 42/5
1/20*m = 42/5 // : 1/20
m = 42/5/1/20
m = 168
m = 168
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