При x=1; 3•1-2=1
При х=2/3; 3•2/3-2=6/3-2=5-2=3
72-x=54 37+x=64-19
x=72-54 37+x=45
x=18 x=45-37
x=8
x-290=470+230 15*x=630:7
x+290=700 15*x=90
x=700+290 x=90:15
x=990 x=6
7(a+b)
10+ax
c-7k
m-(2+n)
2ab
(x+y)(x-y)
c+10
c-3
2c
c/3
271,3 = 271,29
145,48 = 145,50
417,1 = 417,9
1529 = 1530
6,99 = 7,0-7
1400 = 1300