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0.4x-0.3=-0.4
We move all terms to the left:
0.4x-0.3-(-0.4)=0
We add all the numbers together, and all the variables
0.4x+0.1=0
We move all terms containing x to the left, all other terms to the right
0.4x=-0.1
x=-0.1/0.4
x=-0.1/0.4
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