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0.5-0.4x=-3.5
We move all terms to the left:
0.5-0.4x-(-3.5)=0
We add all the numbers together, and all the variables
-0.4x+4=0
We move all terms containing x to the left, all other terms to the right
-0.4x=-4
x=-4/-0.4
x=+10
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