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Kruka [31]
3 years ago
13

Pls tell me what the correct answer would be ❤️

Mathematics
1 answer:
mrs_skeptik [129]3 years ago
4 0

Answer:

Step-by-step explanation:

The error is in the second step. For some unknown reason, the x was dropped and the 3 was subtracted from the 7.

It should be

9x +3x + 12 =  7

12x + 12 = 7                  Subtract 12 from both sides.

12x + 12 - 12 = 7 - 12    Combine

12x = -5                        Divide by 12

12x/12 = -5/12              

x = -5/12 or x = - 0.4167

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