a+b=180 (смежные)
a:b=2:7 => a=2/7 * b
2/7 *b+b=9/7*b=180 => b=7/9 * 180 = 140
7a = 2b (b - больше)
b-a=b-2/7*b=5/7 *b = 5/7 * 140 = 100
