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100+0.4x=0.75x
We move all terms to the left:
100+0.4x-(0.75x)=0
We add all the numbers together, and all the variables
0.4x-(+0.75x)+100=0
We get rid of parentheses
0.4x-0.75x+100=0
We add all the numbers together, and all the variables
-0.35x+100=0
We move all terms containing x to the left, all other terms to the right
-0.35x=-100
x=-100/-0.35
x=285+0.25/0.35
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