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27:
3x-5=22
3x=22+5
3x=27
x=27/3
x=9(3)
28:
length=3l
breadth=2l
perimeter=2(l+B)
=2(3l+2l)
=2(5l)
=10l(2)
29:
7y+5=21
7y=21-5
7y=16
y=16/7(4)
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