HURRY PLEASE IM RUNNING OUT OF TIME. Describe the meaning of X + Y = Z in the novel everything everything

there is no excerpt.

put the excerpt in the comments and ill answer.

being untruthful

eating too much

overstaying one's welcom

this is that correct answer.

in our power to make a world happy - to teach mankind the art of being so - to a character hitherto unknown - and to have, as it were, a new creation intrusted to our hands, are honors that command reflection, and can neither be too highly estimated,

the central idea is basically saying that juveniles that have committed a crime will not have the same consequences as the   adults that have. they will have a softer punishment than what the adults have that is harsh in some ways.