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m in (-oo:+oo)
25-((1/5)*m) = 18 // - 18
25-((1/5)*m)-18 = 0
(-1/5)*m-18+25 = 0
7-1/5*m = 0 // - 7
-1/5*m = -7 // : -1/5
m = -7/(-1/5)
m = 35
m = 35
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