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-x+0.5=-0.4
We move all terms to the left:
-x+0.5-(-0.4)=0
We add all the numbers together, and all the variables
-1x+0.9=0
We move all terms containing x to the left, all other terms to the right
-x=-0.9
x=-0.9/-1
x=0.9/1
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