[(x+3)(x+4)-(x+5)(x+2)]/[(x+2)(x+4)]=[(x+7)(x+8)-(x+9)(x+6)]/[(x+6)(x+8)]
(x^2+7x+12-x^2-7x-10)/[(x+2)(x+4)]=(x^2+15x+56-x^2-15x-54)/[(x+6)(x+8)]
1/[(x+2)(x+4)]=1/[(x+6)(x+8)]
(x+2)(x+4)=(...
[(x+3)(x+4)-(x+5)(x+2)]/[(x+2)(x+4)]=[(x+7)(x+8)-(x+9)(x+6)]/[(x+6)(x+8)]
(x^2+7x+12-x^2-7x-10)/[(x+2)(x+4)]=(x^2+15x+56-x^2-15x-54)/[(x+6)(x+8)]
1/[(x+2)(x+4)]=1/[(x+6)(x+8)]
(x+2)(x+4)=(...