Simplifying a rational or algebraic expression and solving

The question presents a complex fraction or rational equation that must be simplified through algebraic manipulation before solving for the unknown.

turkey-yks 2014 Q6 View
$a$ is a real number and
$$\left( 1 - a + a ^ { 2 } \right) \left( \frac { 1 } { a ^ { 2 } } + \frac { 1 } { a ^ { 3 } } \right) = 9$$
Given this, what is $a$?
A) $\frac { 1 } { 2 }$
B) $\frac { 3 } { 2 }$
C) $\frac { 1 } { 3 }$
D) $\frac { 2 } { 3 }$
E) $\frac { 1 } { 4 }$
turkey-yks 2015 Q2 View
$$\frac { \sqrt { 2 - 2 x } } { \sqrt { 3 + 3 x } } = \frac { 1 } { 2 }$$
Given that this holds, what is x?
A) $\frac { 2 } { 7 }$
B) $\frac { 3 } { 8 }$
C) $\frac { 4 } { 9 }$
D) $\frac { 5 } { 11 }$
E) $\frac { 7 } { 12 }$
turkey-yks 2015 Q4 View
$$\frac { \frac { 4 } { 3 } + \frac { 3 } { 4 } } { \frac { 2 } { 3 } - \frac { 1 } { 4 } }$$
What is the result of this operation?
A) 5
B) 10
C) 15
D) 20
E) 25