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0.4=x-0.9
We move all terms to the left:
0.4-(x-0.9)=0
We get rid of parentheses
-x+0.9+0.4=0
We add all the numbers together, and all the variables
-1x+1.3=0
We move all terms containing x to the left, all other terms to the right
-x=-1.3
x=-1.3/-1
x=1+0.3/1
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