x=2x,求x等于几

x=2x,求x等于几 (x-1)(x-2)(x-3)(x-4)=(x+5)(x+6)(x+7)求X等于几? 求x等于几 5x=1+2,求X等于几 50=2^x求x等于几, 300x=90 x=?求x等于几 5x-3x=1 求x等于几? 5.4x+x=12.8,x等于几,求算式 y*y*y*y+2x*x*x*x=4x*x*y 求x等于几,y等于几,写出所有选项! 7x=2 x等于几 |X|=-x x等于几?为什么 x+x+x=15,x+y+y=19,求y-x等于几 x-x=x,x等于几x-x=x,x是几 (7X+6)-3X=4*(2X+5)等于几?怎么求? 2(X十3)=5X求X等于几? x+1=x+2 x等于几? 2X+X+20=110.X等于几?jikuai 2x=4-x,x等于几