(5^x+1)+5^x=750 и (13^2x+1)-(13^x)-12=0

Question

(5^x+1)+5^x=750

и

(13^2x+1)-(13^x)-12=0

Answer 1

5x+1+5x-750=0
5x+5x-750-1=0
10x=751
x=75,1
и
13^2x+1)-(13^x)-12=0
13*2x+1-13x-12=0
26x-13x-13=0
13x=13
x=1