` d ) [ (123/234) * ((-567)/678) - (111/678)*(123/234)] `
`+ [ ((-111)/234)*(765/876) - (111/234)*(111/876)]`
`⇔ [ (123/234) * ((-567)/678) - (111/678))] + [ (111/234)*((-765/876)-(111/876))`
` ⇔ [ (123/234) * ((-678)/678) ] + [ (111/234)*((-876)/876) ]`
` ⇔ ((-123)/234) + ((-111/234)`
` ⇔ (-234)/234 = -1`
`color(blue){#KAITO#}`