R+787=506+391

To solve this equation, we need to isolate the variable on one side of the equation.

Let's simplify the given equation step by step:

1. Starting with the equation: r + 787 = 506 + 391

2. Combine like terms on the right side of the equation: r + 787 = 897

3. Subtract 787 from both sides of the equation to isolate the variable r: r = 897 - 787

4. Simplify the right side of the equation: r = 110

Therefore, the solution to the equation r + 787 = 506 + 391 is r = 110.