a) (1.x+1)(x-1)-1(x-2)2=5
\(\Leftrightarrow\)(x+1)(x-1)-(x2-4x+4)=5
\(\Leftrightarrow\)x2-1-x2+4x-4=5
\(\Leftrightarrow\)4x-5=5
\(\Leftrightarrow\)4x=10
\(\Leftrightarrow\)x=2,5
b)(3m+1)2-m=5
\(\Leftrightarrow\)6m+2-m=5
\(\Leftrightarrow\)5m+2=5
\(\Leftrightarrow\)m=\(\dfrac{7}{5}\)