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7 x - 3 = 25

7 x = 25 + 3

7 x = 28

x = 4

5 x - 1 = 2 x + 2

5 x - 2 x = 2 + 1

3 x = 3

x = 1

y + 5 = - 12

y =  - 12 - 5

y = - 17

t - 7 = - 9

t = - 9 + 7

t = - 2

3 z = 7

z =  7/3

w/8 = 3

w = 24

7 m + 4 = - 8

7 m = - 8 - 4

7 m = - 12

m = - 12/7

z - 8 + z + z + 3 =  61

3 z = 61 + 8 - 3

3 z =  66

z =  11  

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