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0.4+1.0-x=0.9
We move all terms to the left:
0.4+1.0-x-(0.9)=0
We add all the numbers together, and all the variables
-1x+0.5=0
We move all terms containing x to the left, all other terms to the right
-x=-0.5
x=-0.5/-1
x=0.5/1
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