(x/5+6)×2=x-x/5-62x/5+12=4x/5-64x/5-2x/5=12+62x/5=18x=18×5/2x=45
(1/5x+6)X2=x-1/5x-6解: 2/5x+12=4/5x-6 2/5x+18=4/5 2/5x=18 x=45