If $3x+b=5x-7$ and $3y+c=5y-7$ where b and c are constants and if $b+c=2,$ which of the following is true?

Question

$\begin{array}{1 1} a)\;x\;=\;8\;+\;y\\ b)\;x\;=\;-8\;-\;y \\ c)\; x\;=\;8\;-\;y\\ d)\;x\;=\;y\;-\;8\end{array} $