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x-1/3-1=3x-2x+1/2 2(X-1)-6=18X-3(2X+1) 2X-2-6=18X-6X-3 -10X=5 X=-1/2. ∴另一方程的解為-2, ∴-2+(-12-a)/3=-a -6-12-a=-3a 2a=18 a=9.
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