31+15=46 ; 78-32=46 - равенство.
64+26=90 ; 24+36=60 - неравенство.
(8+4)*3=8*3+4*3
(6+7)*7=6*7+49
(5+4)*8=5*8+32
(7+9)*5=35+45
(7+8)*9=63+72
(6+9)*6=36+54
1*3=3
21*3=63
34-4*2=26
56-6*2=44
5*5=25
10:5*3=6
1360:8*4=170*680
20:5*4=4*4=16
3+x=4
x= 4-3
x=1
8-x=2
-x=2-8
-x=-6
x=6