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54=36^x+3*6^x
We move all terms to the left:
54-(36^x+3*6^x)=0
We get rid of parentheses
-36^x-3*6^x+54=0
Wy multiply elements
-36^x-18x+54=0
We add all the numbers together, and all the variables
-18x-36^x+54=0
We move all terms containing x to the left, all other terms to the right
-18x-36^x=-54
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