Solving each equation:

1) 7y + 9 - 5y = 13
Combine like terms:
2y + 9 = 13
Subtract 9 from both sides:
2y = 4
Divide by 2:
y = 2

2) (720 + e) 501 = 365730
Expand the left side:
720 501 + e * 501 = 365730
360720 + 501e = 365730
Subtract 360720 from both sides:
501e = 5010
Divide by 501:
e = 10

3) (r + 2958) / 87 = 134
Multiply both sides by 87:
r + 2958 = 11658
Subtract 2958 from both sides:
r = 8700

Therefore, the solutions are:
1) y = 2
2) e = 10
3) r = 8700