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-0.4=0.9x=-2.29
We move all terms to the left:
-0.4-(0.9x)=0
We add all the numbers together, and all the variables
-(+0.9x)-0.4=0
We get rid of parentheses
-0.9x-0.4=0
We move all terms containing x to the left, all other terms to the right
-0.9x=0.4
x=0.4/-0.9
x=-0.4/0.9
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