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195=20x+30
We move all terms to the left:
195-(20x+30)=0
We get rid of parentheses
-20x-30+195=0
We add all the numbers together, and all the variables
-20x+165=0
We move all terms containing x to the left, all other terms to the right
-20x=-165
x=-165/-20
x=8+1/4
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