Answer:
1. x+4=9
x=9-4
x=5
2. x+7=20
x=20-7
x=13
3. x+8=12
x=12-8
x=4
4. x+9=9
x=9-9
x=0
5. x+2=7
x=7-2
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Answer:
1. x+4=9
x=9-4
x=5
2. x+7=20
x=20-7
x=13
3. x+8=12
x=12-8
x=4
4. x+9=9
x=9-9
x=0
5. x+2=7
x=7-2
x=5