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4*5^x-3(0.4)^2x=11
We move all terms to the left:
4*5^x-3(0.4)^2x-(11)=0
Wy multiply elements
20x-3(0.4)^2x-11=0
We move all terms containing x to the left, all other terms to the right
20x-3(0.4)^2x=11
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