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50=1.2*3.1^x
We move all terms to the left:
50-(1.2*3.1^x)=0
We get rid of parentheses
-1.2*3.1^x+50=0
We move all terms containing x to the left, all other terms to the right
-1.2*3.1^x=-50
x=-50/1
x=-50
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