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x-(1.25x)=100
We move all terms to the left:
x-(1.25x)-(100)=0
We add all the numbers together, and all the variables
x-(+1.25x)-100=0
We get rid of parentheses
x-1.25x-100=0
We add all the numbers together, and all the variables
-0.25x-100=0
We move all terms containing x to the left, all other terms to the right
-0.25x=100
x=100/-0.25
x=-400
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