What is the next perfect square after 36?

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation.