7. At a language school, students have to be proficient in at least one of the languages, Italian, Spanish or Japanese. In a particular group of 33 students, 2 are proficient in all three languages, 3 in Italian and Spanish only, 4 in Spanish and Japanese only and 5 in Japanese and Italian only. The number proficient in Italian only is x, in Spanish only is x and in Japanese only is (x+1). Illustrate this information by a clearly labelled Venn diagram, showing the number in each separate region. Find x and hence find the total number proficient in Italian?​