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75x+6.25-20=398.75
We move all terms to the left:
75x+6.25-20-(398.75)=0
We add all the numbers together, and all the variables
75x-412.5=0
We move all terms containing x to the left, all other terms to the right
75x=412.5
x=412.5/75
x=5+25/50
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