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4.5+2.25x=100
We move all terms to the left:
4.5+2.25x-(100)=0
We add all the numbers together, and all the variables
2.25x-95.5=0
We move all terms containing x to the left, all other terms to the right
2.25x=95.5
x=95.5/2.25
x=42+1/2.25
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