ONCE 2(x + 4) = -3.1 - 12
2x + 8 = -3x - 12
20 + 8 +31 = -31 -12 + 3.1
51 +8 = -12
56 +8 - 8 = -12 - 8
5x = -20
5x t = -20
1. Distributive property
2. Addition property of equality
3. Simplification
4. Subtraction property of equality
5. Simplification
6. Division property of equality
7. Simplification
=-4
Step 2 is incorrect and should be 2x + 8 - 3x = -3x - 12 + 3x.
Step 6 is incorrect and should be 5x -5 = -20 - 5.
The justification in step 6 is incorrect and should be the multiplication property of equality
The justification in step 4 is incorrect and should be the addition property of equality
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