Question

(x加7分之x加8)加(x加8分之x加9)等于(x加6分之x加7)加(x加9分之x加10)

Answer 1

（x+8)/(x+7)+(x+9)/(x+8)=(x+7)/(x+6)+(x+10)/(x+9)

（x+8)/(x+7)-(x+7)/(x+6)=(x+10)/(x+9)-(x+9)/(x+8)

1+1/(x+7)-1-1/(x+6)=1+1/(x+9)-1-1/(x+8)

(x+7-x-6)/(x+7)(x+6)=(x+9-x-8)/(x+9)(x+8)

(x+7)(x+6)=(x+9)(x+8)

x=7.5