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208.21=0.5*5.058*18x-0.5*5.058x^2
We move all terms to the left:
208.21-(0.5*5.058*18x-0.5*5.058x^2)=0
We get rid of parentheses
-0.5*5.058*18x+0.5*5.058x^2+208.21=0
We move all terms containing x to the left, all other terms to the right
-0.5*5.058*18x+0.5*5.058x^2=-208.21
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