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9^(x+1)+3=28*3^x
We move all terms to the left:
9^(x+1)+3-(28*3^x)=0
We get rid of parentheses
9^(x+1)-28*3^x+3=0
Wy multiply elements
9^(x+1)-84x+3=0
We add all the numbers together, and all the variables
-84x+9^(x+1)+3=0
We move all terms containing x to the left, all other terms to the right
-84x+9^(x+1)=-3
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