Answer:
If the problem is asking
then the answer is 4
If it's asking
then the answer is 
Step-by-step explanation:
Divide everything by 4 getting:
7y=3x+21
then get all of the variables on one side by subtracting 3x:
7y-3x=21
Answer:
Step-by-step explanation:
5x + 2 - 3x - 1 = 3x + 2
5x - 3x - 3x = - 2 + 1 + 2
5x - 6x = 1
-1x = 1
x = 1 / -1
x = -1
No solution since both variables cancel
8 inches
Divide 56 by 7 which equals 8 so Fred's frog jumped 8 inches.