Answer:
x = 3
Explanation:
The first error was in the 2nd line: -5(x - 1) is -5x + 5, not -5x - 5 = 20.
Continuing the solution:
10x - 5x + 5 = 20
Combining like terms, we get
5x = 15, and so x = 3
10x - 5(x - 1) = 20
5x + 5 = 20
5x = 20 - 5
5x = 15
x = 15/5
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