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liraira [26]
4 years ago
12

The sum of twice a number and 3 is equal to the sum of the number and 9

Mathematics
1 answer:
Ksivusya [100]4 years ago
6 0

n - the number

The equation:

2n + 3 = n + 9    |-3

2n = n + 6    |-n

<u>n = 6</u>

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