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0.5x+0.8=0.9x-0.4
We move all terms to the left:
0.5x+0.8-(0.9x-0.4)=0
We get rid of parentheses
0.5x-0.9x+0.4+0.8=0
We add all the numbers together, and all the variables
-0.4x+1.2=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-1.2
x=-1.2/-0.4
x=2+0.4/0.4
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