Individual amino acids may be linked together, one after another, like the wagons of a train. What is the chemical bond that is used to attach on amino acid to the next?

showing a photograph would make this a hell of alot easier

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

2%? i tried finding the exact sorry if it's not 100% correct ; -;