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Use natural logs.
5^(8-2X) = 25
ln5^(8-2X) = ln25
8-2X ln5 = ln25
8-2X = ln25/ln5
8-2X = 2
subtract 8 from each side
-2X = -6
divide each side by -2
X = 3
check
5^(8-3(2)) = 25
5^2 = 25
25 = 25
checks
m-12=25. m=37
x=-.25.
30
4a + a = 25 add 4a and a 5a = 25 then divide 25 by 5 a = 5
25
5.
25-7=18 18/3=6
-5x+50 = 25 -5x = 25-50 -5x = -25 x = 5
x = 25 / 3squared + 5
Divide each side of the equation by 10 .
5n-25 = 10 5n = 10+25 5n = 35 n = 7