Answer:
B x=1
Explanation:
625 = 5^(7x-3)
Rewrite 625 as 5^4
5^4 = 5^(7x-3)
Since the bases are the same, the exponents must be the same
a^b = a^c means b=c
4 = 7x-3
Add 3 to each side
4+3 = 7x-3+3
7 =7x
Divide by 7
7/7 =7x/7
1 =x
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