What belongs in the box marked with the question mark in the proof? given: 3x - 4 = 2(x + 8), prove: x = 20 1. 3x - 4 = 2(x + 8) | 1. 2. 3x - 4 = 2x + 16 | 3. 3x = 2x + 20 | 3. 4. x = 20 | 4. ( what is the process called like what did they do to 3 to get 4 )

Given: 3x - 4 = 2(x + 8), Prove: x = 20 
1. 3x - 4 = 2(x + 8)     | 1. ___Given 
2. 3x - 4 = 2x + 16     |  2.___Distributive property 
3. 3x = 2x + 20          |  3. ___addition property of equality
4. x = 20                    |  4. ___subtraction property of equality

True
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