Jasmine wants to use the elimination method to solve the following system of equations:

Equation A: $\displaystyle{5}{x}+{2}{y}={12}\usepackage{cmbright}\Huge\$

Equation B: $\displaystyle{6}+{3}{x}={y}\usepackage{cmbright}\Huge\$

She wants to solve for x. As a first step, which of the following makes the most amount of sense?