Question 631837
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Hi,
3 (x + 7) = 12x – 51     
 3x + 21 = 12x - 51      | Step I:  Distribute


2x – 7 – (x – 5) = 0
2x - 7 - x + 5 = 0        | Step I:  Distribute
    x - 2  = 0            | Step II: Combine Like Terms