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X=0.5^3-20X+4
We move all terms to the left:
X-(0.5^3-20X+4)=0
We get rid of parentheses
X+20X-4-0.5^3=0
We add all the numbers together, and all the variables
21X-4.125=0
We move all terms containing X to the left, all other terms to the right
21X=4.125
X=4.125/21
X=3.6666666666667/18.666666666667
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