Answer:
r = -2
Step-by-step explanation:
1. 5 + 0.1r = 3 (1 - 0.3r)
Remove the parenthesis. Multiply 3 by 1 (3). Multiply 3 by 0.3r (0.9r).
2. 5 + 0.1r = 3 - 0.9r
Move the terms with r together and the terms without r together.
4. 0.1r + 0.9r = 3 - 5
The like terms should be together. Do 0.1r + 0.9r (1r). Do 3 - 5 (-2)
4. 1r = -2
Remove 1 since when 1 is multiplied by a variable you'd get the variable.
5. r = -2
