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12.5=4.5+(10.5-4.5)^x
We move all terms to the left:
12.5-(4.5+(10.5-4.5)^x)=0
We add all the numbers together, and all the variables
-(4.5+6^x)+12.5=0
We get rid of parentheses
-6^x-4.5+12.5=0
We add all the numbers together, and all the variables
-6^x+8=0
We move all terms containing x to the left, all other terms to the right
-6^x=-8
x=-8/1
x=-8
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