1000x=10000 x等于几

1000x=10000 x等于几 |X|=-x x等于几?为什么 x-x=x,x等于几x-x=x,x是几 0.8x+x=108等于几x＝几 x=1400等于几 X*4.5%+（300000-X）*3.5%=10000 等于几 0=-5x x等于几 x²=225 x等于几? 0.8x+x=108等于几 7x=2 x等于几 6X+0.27=25.4 X等于几?6X+0.27=25.4 X等于几? 4x-x等于几 7x*x等于几 几x几等于2400. x、y等于几 X等于几? 未知数x等于几? x等于 几