Solve each equation below and justify your steps using a proof table. Show your work.

1. 12x – 4(2x – 10) = 6 ­ – (x + 3)
2. 3(x – 2) + 7 = -4 + 2(x + 1)

3. Why is 2 over 3 x space plus 7 over 2 equals space 3 the same as 4x + 21=18? What property was used to rewritex

 
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