111,11:(21,45 - 9,7х) - 3,2 = 51

111,11:(21,45 - 9,7х)= 51+3.2111,11:(21,45 - 9,7х)=54,221,45- 9,7х =111,11:54,221,45-9,7х = 2,059,7х = 21,45- 2,059,7= 19,4х= 19,4:9,7х= 2