Descobre o valor de $A$

Descobre o valor de A.

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1. Ora,
   $$\begin{array}{*{20}{c}}   {A \times 12 =  – 204}& \Rightarrow &{\begin{array}{*{20}{l}}   A& = &{\frac{{ – 204}}{{12}}} \\   {}& = &{ – 17} \end{array}} \end{array}$$
2. Ora,
   $$\begin{array}{*{20}{c}}   {A \times \left( { – 15} \right) =  – 135}& \Rightarrow &{\begin{array}{*{20}{l}}   A& = &{\frac{{ – 135}}{{ – 15}}} \\   {}& = &9 \end{array}} \end{array}$$
3. Ora,
   $$\begin{array}{*{20}{c}}   {A \times \left( { – 11} \right) = 165}& \Rightarrow &{\begin{array}{*{20}{l}}   A& = &{\frac{{165}}{{ – 11}}} \\   {}& = &{ – 15} \end{array}} \end{array}$$
4. Ora,
   $$\begin{array}{*{20}{c}}   {A \times 13 = 169}& \Rightarrow &{\begin{array}{*{20}{l}}   A& = &{\frac{{169}}{{13}}} \\   {}& = &{13} \end{array}} \end{array}$$