7х +5х+0.28=9,1 6х-14,7=22,05 (5,8+х)•5,3=31,482 0,72:(0,8-х)=1,5 12-х:1,05=1,08 Помогите пожалуйста очень надо

7х +5х+0.28=9,1 12x = 9,1-0,28 12x = 8,82 x = 8,82/12 x = 0.735 6х-14,7=22,05 6x = 22.05+14.7 6x = 36.75 x = 6.125 (5,8+х)•5,3=31,482 5.8+x = 31.482/5.3 5.8+x = 5.94 x = 5.94-5.8 x = 0.14 0,72:(0,8-х)=1,5 0.8-x = 0.72/1.5 0.8-x = 0.48 x = 0.8-0.48 x = 0.32 12-х:1,05=1,08 x/1.05 = 12-1.08 x/1.05 = 10.92 x = 10.92*1.05 x = 11.466