1,4x+14=0.6x+0.4
1,4х-0,6х=0,4-14
<span>0,8х=-13,6 </span>
<span>0,8х=-13,6 : 0,8 </span>
<span>х=-17 </span>
<span>Ответ: -17</span>
1) 100-(42+18)+20=100-60+20=60 2) 31+(50-21)-23=31+29-23=37 3) 34+(75-47)+37=34+28+37=99
55/12-y=2.5
y=55/12-2.5
y=(55-30)/12
y=25/12