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Sunday, June 30, 2019
Exponential equation
3
x+2
– 3
x+1
+ 3
x
= 21
3
x
3
2
- 3
x
3
1
+ 3
x
= 21
3
x
(9-3+1) = 21
3
x
× 7 = 21
3
x
= 21/7
3
x
= 3
1
x = 1
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