Question

Solve for r.
-13 = r/9 +8

Answer 1

r = - 189

first:

-13 -8 = -21

add the two negative number together and get -21

second:

r/9 >> 9 * -21

multiply 9 and -21 together and get -189

r = -189

Answer 2

r/9 = -21
Multiply by 9
r = -189