<span>34.1-18.4=15.7
0.7*15.7=10.99
</span>0.5*18.6=9.3
10.99+9.3=20.29
<span>9.8+1.6=11.4
11.4*1.4=15.96
20.29-15.96=4.33</span>
-2x+8 = -0.8
-2x = -0.8-8
2x = 8.8
<span>x = 4.4</span>
<span>10801-x=5400
х=</span>10801-5400
х=5401
<span>1703+x=1213+490
</span>1703+x=1703
х=0
<span>x:3-18=12
</span>х;3=18+12
х:3=30
х=90
<span>5*x+80=690
</span>5*х=690-80
5*х=610
х=610:5
х=122
<span>x*8+120=280
</span>х*8=280-120
х*8=160
х=160:8
х=20.