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1.2^x+1.2^2x=10^12
We move all terms to the left:
1.2^x+1.2^2x-(10^12)=0
We add all the numbers together, and all the variables
1.2^x+1.2^2x-1000000000000=0
We move all terms containing x to the left, all other terms to the right
1.2^x+1.2^2x=1000000000000
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