Simplify the Following Expression $- \frac { 1 } { 2 } + \frac { 4 } { 7 }$

Simplify the following expression. $- \frac { 1 } { 2 } + \frac { 4 } { 7 }$

A) $\frac { 1 } { 14 }$
B) $\frac { 29 } { 14 }$
C) $- \frac { 1 } { 14 }$
D) $1$
E) $- \frac { 29 } { 14 }$