Since you have y=14 for both it’s easy! -214 is 214 blocks away from 0, 234 is 234 blocks from 0 since they are on positive and negative sides you have to add them 214+234= 448 units away
Robert is 13 and his brother is 3 y.o. X... brother’s age X+10... Robert’s age X+10+2... Robert’s age in 2 years X+2...Brother’s age in 2 years X+10+2/x+2=3 X=3 X+10=13