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0.83x+0.35=-0.2
We move all terms to the left:
0.83x+0.35-(-0.2)=0
We add all the numbers together, and all the variables
0.83x+0.55=0
We move all terms containing x to the left, all other terms to the right
0.83x=-0.55
x=-0.55/0.83
x=-0.55/0.83
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