factorize m²-26m+133
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m^2 - 26x + 133 = 0
m^2 - 19m - 7m + 133 = 0
m ( m - 19 ) - 7 ( m - 19 ) = 0.
( m - 19 ) (m - 7) = 0
( m - 19 ) = 0 or ( m - 7) = 0
m^2 - 19m - 7m + 133 = 0
m ( m - 19 ) - 7 ( m - 19 ) = 0.
( m - 19 ) (m - 7) = 0
( m - 19 ) = 0 or ( m - 7) = 0
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