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400+75x=1.000-25x
We move all terms to the left:
400+75x-(1.000-25x)=0
We add all the numbers together, and all the variables
75x-(-25x+1)+400=0
We get rid of parentheses
75x+25x-1+400=0
We add all the numbers together, and all the variables
100x+399=0
We move all terms containing x to the left, all other terms to the right
100x=-399
x=-399/100
x=-3+99/100
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