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m in (-oo:+oo)
34 = 7*m+4*m+1 // - 7*m+4*m+1
34-(7*m)-(4*m)-1 = 0
34-7*m-4*m-1 = 0
33-11*m = 0 // - 33
-11*m = -33 // : -11
m = -33/(-11)
m = 3
m = 3
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