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21) Let the number be x.
Acc. to question:
7x-3 = 18
= 7x = 18+3
= 7x = 21
= x = 21/7
x = 3 Ans.
Therefore, the required number = 3
22) 5x+2 = 3x+12
= 5x-3x = 12-2
= 2x = 10
= x = 10/2
= x = 5 Ans.
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