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450=300+0.04x
We move all terms to the left:
450-(300+0.04x)=0
We add all the numbers together, and all the variables
-(0.04x+300)+450=0
We get rid of parentheses
-0.04x-300+450=0
We add all the numbers together, and all the variables
-0.04x+150=0
We move all terms containing x to the left, all other terms to the right
-0.04x=-150
x=-150/-0.04
x=+3750
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