One strategy to solve this problem is to solve it as a system of equations.
3x − 2y = 24
6x − y = 3

Multiply the bottom equation by −2 to cancel out the y's.

3x − 2y = 24
−12x + 2y = −6
−9x = 18

Solve for x, then substitute the value back into one of the original equations to solve for y.