Answer:
[tex]\huge\boxed{x = 20; x=-2}[/tex]
Step-by-step explanation:
In equations, you can perform any operation (with a few exceptions), as long as it is to both sides of the equation. As such, when approached with a problem such as x-15 = 5, isolate the variable, by adding 15 to both sides, changing the problem to x - 15 + 15 = 5 + 15. Then, because -15 + 15 = 0, it becomes x + 0 = 5 + 15 --> x = 20.
In the other scenario: 2x + 5 = 1:
2x + 5 - 5 = 1 - 5
2x = -4
2x ÷ 2 = -4 ÷ 2
x = -2
Hope it helps :) and let me know if you want me to elaborate
