Math question.

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Can someone me do math because i am having a breakdown rn because i don’t get it

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.