an acronym that i use that helps me is D.C.M.S. ( distribute, combine like terms, move variable, solve) so first you want to distribute, but since there is no need for distribution in this problem, we can skip that, as well as combining like terms. so then, we have to move the variable. i moved the 3x by subtracting it on both sides. so now we have 5x+4=2. then you just solve from there; subtract 4: 5x= -2; divide by 5. hope this helps :)
option C is the correct answer because the continents used to be part of a larger supercontinent called Pangea and when the continents split the fossils went with it
