8.2x-7.4x=9 0.8x=9 x=11.25
解:0.8X=9 X=9÷0.8 X=11.25
化简得 0.8x=9
x=45/4
8.2X-7.4X=9 解:0.8X=9 X=11.25
0.8x=9x=11.25