Answer:
for number 1: y = 4
for number 2: k = -8
for number 3: d = 21
Explanation:
1. 7y=28
7÷7y=28÷7
y=4
2.-4k=40-8
-4k÷-4=32÷-4
k= -8
3. 47+5=2d
42=2d
42÷2=2d÷2
21=d
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