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0.6+0.4x=0.4^x
We move all terms to the left:
0.6+0.4x-(0.4^x)=0
We get rid of parentheses
0.4x-0.4^x+0.6=0
We move all terms containing x to the left, all other terms to the right
0.4x-0.4^x=-0.6
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