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7 x - 5 x - 3  =  5 x - 15 + 2

2 x - 5 x  = - 13 + 3

- 3 x = - 10

x = 10/3

7 n + 14 - 3 = 25 - 3 n - 4

7 n + 3 n =  21 - 14 + 3

10 n =  10

n  = 1

4 y + 12 y - 6 = 3 y + 3

16 y - 3 y = 3 + 6

13 y = 9

y = 9/13  

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