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7x - 4x = 16 - 1
3x = 15
x =15/3
x = 5.
2) 6x = 3x + 15
6x - 3x = 15
3x = 15
x = 15/3
x = 5.
3) 3x = 15
x = 15/3
x = 5
4) 4x + 3 = 2x + 25
4x - 2x = 25 - 3
2x = 22
x = 22/2
x = 11.
5) 3x + 1 = x + 5
3x - x = 5 - 1
2x = 4
x = 4/2
x = 2
6) 22 - x = x - 11
-x - x = -11 - 22
- 2x = - 33
x = 33/2.