23-(x+3.5x)=7x等于几

23-(x+3.5x)=7x等于几 7x=2 x等于几 7x*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 7x-5x=20 那么,x等于几 x^2+7x+10=0 x等于几? (x-1)(x-2)(x-3)(x-4)=(x+5)(x+6)(x+7)求X等于几? x等于7,则x等于几 负x等于7,则x等于几 0.8x+x=108等于几x＝几 0=-5x x等于几 x²=225 x等于几? 1000x=10000 x等于几 0.8x+x=108等于几 x=1400等于几 X*4.5%+（300000-X）*3.5%=10000 等于几 9减x=8分之7,x等于几? 4x-x等于几