4.найди значения x: 56/7 + (x - 15/8) = 81/8; (x - 18/9) + 37/18=44/27

56/7+х-15/8=81/8
х=81/8+15/8-56/7
х=96/8=56/7
х=672/56-448/56
х=224/56
х=112/28
х=56/14
х=4

х-18/9+37/18=44/27
х-36/18+37/18=44/27
х+1/18=44/27
х=44/27-1/18
х=88/54-3/54
х=85/54