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75=x-0.4x
We move all terms to the left:
75-(x-0.4x)=0
We add all the numbers together, and all the variables
-(+0.6x)+75=0
We get rid of parentheses
-0.6x+75=0
We move all terms containing x to the left, all other terms to the right
-0.6x=-75
x=-75/-0.6
x=+125
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