T(0.2+1.7)=0.22+0.54
1.9t=0.22+0.54
1.9t=0.76
t=0.76:1.9
t=0.4
z(5.6-2-0.7)=7-2.65
2.9z=7-2.65
2.9z=4.35
z=4.35:2.9
z=1.5
(3х - 13 ) + 196 = 222
3х - 13 = 222 - 196
3х - 13 = 26
3х = 26 + 13
3х = 39
х = 39 : 3
<u>х = 13</u>
<u>проверка:</u>
(3 * 13 - 13) + 196 = 222
(39 - 13) + 196 = 222
26 + 196 = 222
222 = 222
Х+6.4-4.91=5.35
х+1.49=5.35
х=5.35-1.49
х=3.86