3 1/2 • (2/3x+4/7)=2 1/3
3 1/2 * 2/3х + 3 1/2 * 4/7 = 2 1/3 7/2 * 2/3х + 7/2 * 4/7 = 2 1/3 7/3х + 2 = 2 1/3 7/3х = 2 1/3 - 2 7/3х = 1/3 х = 1/3 : 7/3 х = 1/7