Hello, can someone help me solve and check the following

Question

1) x - 8 = 20 Check:

2) x + 15 = 35 Check:

3) -x +6 = 3 Check:

The symbol 'x' is in italic. If I can understand the symbols better, I belive I can get the hang of the course.

Answer 1

x is a variable, meaning that the value it represents can change. Given the equations, your goal is to find its value.

1)
x - 8 = 20

Add 8 to both sides to isolate x.
x - 8 + 8 = 20 + 8
x = 28

And that is the value of x in problem 1). Try the other problems.

Answer 2

n(r)=|r+2|+3;find h(6)