Answer:
(number #1)
5x-4=21
5x=21+4
5x=25
5x/5=25/5
x=5
(number #2)
3x+9=21
3x=21-9
3x=12
3x/3=12/3
x=4
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Answer:
(number #1)
5x-4=21
5x=21+4
5x=25
5x/5=25/5
x=5
(number #2)
3x+9=21
3x=21-9
3x=12
3x/3=12/3
x=4