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13+0.20x=-0.01x-0.31
We move all terms to the left:
13+0.20x-(-0.01x-0.31)=0
We get rid of parentheses
0.20x+0.01x+0.31+13=0
We add all the numbers together, and all the variables
0.21x+13.31=0
We move all terms containing x to the left, all other terms to the right
0.21x=-13.31
x=-13.31/0.21
x=-63+0.08/0.21
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