3/2k - 9 = 1/8K + 2

I need to find what k is

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Find the solution of each of the following.

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.