Let's solve each equation step by step:

1) 85 + 48/(12-x) = 91

First, we can simplify the left side of the equation by finding the common denominator:

85(12-x) + 48 = 91(12-x)

1020 - 85x + 48 = 1092 - 91x

1068 - 85x = 1092 - 91x

Subtracting 1068 from both sides:

-85x = -24 - 91x

Adding 85x from both sides:

0 = -24 + 6x

Adding 24 from both sides:

6x = 24

Dividing by 6:

x = 4

Therefore, x = 4 for the first equation.

2) 86 - 49/(2x-5) = 79

Following a similar process as above to isolate x:

86(2x-5) - 49 = 79(2x-5)

172x - 430 - 49 = 158x - 395

172x - 430 - 49 = 158x - 395

123 = 14x

x = 123/14

x = 8.7857

Therefore, x ≈ 8.786 for the second equation.