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0.3-0.7x=-0.2
We move all terms to the left:
0.3-0.7x-(-0.2)=0
We add all the numbers together, and all the variables
-0.7x+0.5=0
We move all terms containing x to the left, all other terms to the right
-0.7x=-0.5
x=-0.5/-0.7
x=0.5/0.7
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