For these problems, all we have to do is find the value of the variables
7. r + 354 = 1,321
All we need to do is subtract 1,321 and 354
1,321 - 354 = 967
r = 967
8. d - 21.4 = 87.9
All we need to do is add 87.9 and 21.4
89.7 + 21.4 = 111.1
d = 111.1
9. 5 x g = 230
All we need to do is divide 230 by 5
230 ÷ 5 = 46
g = 46
10. z ÷ 12 = 9
All we have to do is multiply 12 and 9
12 x 9 = 108
z = 108
Hope this helps you
-AaronWiseIsBae