解方程x+7分之x+5-x+5分之x+3=x+6分之x+4-x+4分之x+2
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(x+5)/(x+7)-(x+3)/(x+5)=(x+4)/(x+6)-(x+2)/(x+4)
1-2/(x+7)-1+2/(x+5)=1-2/(x+6)-1+2/(x+4)
1/(x+5)-1/(x+4)=1/(x+7)-1/(x+6)
-1/(x+5)(x+4)=-1/(x+7)(x+6)
(x+5)(x+4)=(x+7)(x+6)
x^2+9x+20=x^2+13x+42
x=-11/2
1-2/(x+7)-1+2/(x+5)=1-2/(x+6)-1+2/(x+4)
1/(x+5)-1/(x+4)=1/(x+7)-1/(x+6)
-1/(x+5)(x+4)=-1/(x+7)(x+6)
(x+5)(x+4)=(x+7)(x+6)
x^2+9x+20=x^2+13x+42
x=-11/2
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