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Neuron
If you would like to solve the equation 8 - 3 * x - x = 12, you can calculate this using the following steps:

8 - 3 * x - x = 12
8 - 4 * x = 12
8 - 12 = 4 * x
- 4 = 4 * x     /4
x = - 1

The correct result would be c) - 1.