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2.50x+3.75x=45
We move all terms to the left:
2.50x+3.75x-(45)=0
We add all the numbers together, and all the variables
6.25x-45=0
We move all terms containing x to the left, all other terms to the right
6.25x=45
x=45/6.25
x=7+1/5
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