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20=0.1^2+0.5x+15
We move all terms to the left:
20-(0.1^2+0.5x+15)=0
We get rid of parentheses
-0.5x-15+20-0.1^2=0
We add all the numbers together, and all the variables
-0.5x+4.99=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-4.99
x=-4.99/-0.5
x=9+0.49/0.5
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