Make 2 + 7^2 - 3^2 / 3^2 - 1 * 5 equal 35 by using grouping (parentheses).
This works out as,
{[(2 + 7)^2 - (3^2)] / (3^2) - 1} * 5
{[(9)^2 - (3^2)] / (3^2) - 1} * 5
{[81 - 9] / (3^2) - 1} * 5
{[72] / (3^2) - 1} * 5
{[72] / (9) - 1} * 5
{8 - 1} * 5
7 * 5
35