/6 5 \ b |- - b - - + b|*a - - + 11*b \a a / a
(6/a - b - 5/a + b)*a - b/a + 11*b
b 1 + 11*b - - a
a - b + 11*a*b -------------- a
(a - b + 11*a*b)/a
b 1 + 11*b - - a
/ 1\ 1 + b*|11 - -| \ a/
1 + b*(11 - 1/a)
a - b + 11*a*b -------------- a
(a - b + 11*a*b)/a