(1) Substitute x=2 into equation 9x-3-a=4x+2 to get: 18-3-a=8+2,

Solution: a = 5；;

(2) The equation is 3x? 12-5=2x+ 13，

Denominator: 3 (3x-1)-30 = 2 (2x+1),

Without brackets: 9x-3-30=4x+2,

Transfer and merger: 5x=35,

Solution: x = 7.