moomoothao:
solve for i: 9x-7i > 3 (3x-7u); 9x-7i > 9x-21u; -7i > -21u; i < 3 u
solve for i: 9x-7i > 3 (3x-7u);
9x-7i > 9x-21u; -7i > -21u; i < 3 u