2/3*(3x - 7y) - 3/4*(6y + 8x) = 2/3*3x - 2/3*7y - 3/4*6y - 3/4*8x = x - 14/3y - 9/2y - 6x = -5x - 55/6y

x = 4 1/3 = 13/3

y = 5/8

-5*13/3 - 55/6 * 5/8  =  -65/3 - 275/48  =  -1040/48 - 275/48  =  - 1315/48  =   - 27  19/48