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2 x - 3 = 4 + x

2 x - x = 4 + 3

x = 7

y + 4 = - 4 - 3 y

y + 3 y = - 4 - 4

4 y = - 8

y = - 2

7 x - 6 = 4  - 3 x

7 x +3 x = 4 +  6

10 x = 10

x = 1

12  - a = 18 - 3 a

-a + 3 a = 18 - 12

2 a = 6

a = 3

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