Multiplying both sides by y+7, we get 2-y=(3y+21)/5 and then by multiplying both sides by 5 we get 10-5y=3y+21. After that, subtract 21 from both sides as well as add 5y to both sides to get -11=8y, so divide by 8 to get -11/8=y
Divide the second number by the first one and then minus 1 from the answer that would be the decimal answer multiply it into 100 to get the percentage answer. Example: 20/16 =1.25
1.25-1= 0.25,
0.25 x100 = 25% increase
repeat this process for all, keep in mind it can also be decrease