Respuesta :

5.

3x - 1 = x + 9

Subtract x on both sides

2x - 1 = 9

Add one on both sides.

2x = 10

Divide by 2 to get the x.

x = 5

Hope this helps!
3x - 1 = x + 9
2x - 1 =       9
2x      =      10
 x       =       5
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