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The pony in grade seven in our school is very careless. He solved the 3x equation? The process of 12-a=2x+ 13 is as follows: Due to careless writing, Pony wrote a constant as "a".
(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.

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