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-0.9=-0.4x
We move all terms to the left:
-0.9-(-0.4x)=0
We get rid of parentheses
0.4x-0.9=0
We move all terms containing x to the left, all other terms to the right
0.4x=0.9
x=0.9/0.4
x=2+0.1/0.4
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