To solve the first equation, you can follow these steps:

Distribute the 5 on the left side of the equation:
5(x) + 5(3) = 725
5x + 15 = 725

Subtract 15 from both sides to isolate 5x:
5x + 15 - 15 = 725 - 15
5x = 710

Divide both sides by 5 to solve for x:
5x/5 = 710/5
x = 142

Therefore, x = 142 for the first equation.

To solve the second equation, you can follow these steps:

Subtract 4949 from both sides:
4949/7 + x - 4949/7 = 20678 - 4949
x = 20678 - 4949/7 - 4949

Calculate the value of x:
x = 20678 - 707 + 142
x = 19913

Therefore, x = 19913 for the second equation.