3^y+3^(y+2)=90

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Solution for 3^y+3^(y+2)=90 equation: 



3^y+3^(y+2)=90

We move all terms to the left:

3^y+3^(y+2)-(90)=0

We move all terms containing y to the left, all other terms to the right

3^y+3^(y+2)=90

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