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0.1x+0.2=-0.3
We move all terms to the left:
0.1x+0.2-(-0.3)=0
We add all the numbers together, and all the variables
0.1x+0.5=0
We move all terms containing x to the left, all other terms to the right
0.1x=-0.5
x=-0.5/0.1
x=-5
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