If a number is added to itself, it is twice that number
→ 18 ÷ 2 = 9
→ 9 + 9 = 18
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18
9
A number x added to 18 would be written x + 18. The value* of x + 18 would depend on the value x. For example, if x was 2, x + 18 would equal 20. if x was 10, x + 18 would equal 28, and so on. *'Value' means what actual number it comes to.
6x + 18 = 4 - x 7x + 18 = 4 7x = -14 x = -2
18