Question

1/7[-1/5(x+2/3+4)-6]+8=9求X=？要过程

要计算的过程，最后的答案要是一个数不是算式

Answer 1

解：1/7[-1/5(x+2/3+12/3)-6]+8=9
1/7[-1/5(x+14/3)-6]+8=9
1/7[-1/5x-14/15-6]+8=9
-1/35x-2/15-6/7+8=9
-1/35x-14/105-90/105=9-8
-1/35x-104/105=1
-1/35x=105/105+104/105
-1/35x=209/105
x=-209/3

Answer 2

X={(9-8)*7+6}*(-5)-4-2/3

Answer 3

1/7[-1/5(x+14/3)-6]=1
1/7[-1/5x-14/15-6]=1
1/7[-1/5x-104/15]=1
-1/35x-104/105=1
-1/35x=209/105
x=209/3