x:4=27-9; 8*x=34+38. 15:x=15*1

x:4 = 27-9 8×x=34+38 15:x = 15×11 15:x=15×1, x не = 0- x = 18 8x = 72 154 -- = 15 x=9 xx=72 15=15x 1 = x x=1, x не = 0 x = 1