10v + 2(7v - 2) = 5(4v +3) + 3v
10v + 14v - 4 = 20v + 15 + 3v
10v + 14v - 20v - 3v = 15 + 4
v = 20
Примерно вот такой ответ 2,50110375
Д) х=3_11/24-1_1/6-1_1/9
х=3_33/72-1_12/72-1_8/72
х=1_13/72
е) у= 2/3+1/8-1/14-5/7
у=112/162+21/162-12/162-120/162
у=1/162