Question

How do you solve `r+ 6= 13`?

Answer 1

Subtract `color(red)(6)` from each side of the equation to solve for `r` while keeping the equation balanced:

`r + 6 - color(red)(6) = 13 - color(red)(6)`

`r + 0 = 7`

`r = 7`

Answer 2

`r=13-6`
`r=7`
Remember, whenever a variable or number is transposed from on hand side(HS) to another hand side, if it was a positive it becomes a negative, if it was a negative it becomes a positive.