Answer:
x = 11
Explanation:
Given
+ 4 = 85 ( subtract 4 from both sides
= 81
=
Since the bases on both sides are equal, both 3 then equate the exponents
x - 7 = 4 ( add 7 to both sides )
X = 11
3^(x-7) = 81
Find what exponent makes three into 81
The answer: x = 11
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