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0.3x-21=0.2x-52
We move all terms to the left:
0.3x-21-(0.2x-52)=0
We get rid of parentheses
0.3x-0.2x+52-21=0
We add all the numbers together, and all the variables
0.1x+31=0
We move all terms containing x to the left, all other terms to the right
0.1x=-31
x=-31/0.1
x=-310
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