=a+a-b-2a+b+2b=2a-b-2a+b+2b=2b
5/9+(х-2/9)=7/9
5/9+х-2/9=7/9
х=7/9-5/9+2/9
х=4/9
1) 172,2x-128,63x=78,426
43,57x=78,426
x=1,8
2) 62,32y-23,27y+17,85y=149,078
56,9y=149,078
y=2,62
3) 178,14z+740,19z-96,43z=205,475
821,9z=205,475
z=0,25
4) (4,32x+2,16x):4,05=0,4
4,32x+2,16x=1,62
6,48x=1,62
x=0,25
3742
* 63
---------
11226
+
22452
--------------
235746