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9+3x=22.50
We move all terms to the left:
9+3x-(22.50)=0
We add all the numbers together, and all the variables
3x+9-(22.5)=0
We add all the numbers together, and all the variables
3x-13.5=0
We move all terms containing x to the left, all other terms to the right
3x=13.5
x=13.5/3
x=4+1/2
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