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X-0.20X=51
We move all terms to the left:
X-0.20X-(51)=0
We add all the numbers together, and all the variables
0.8X-51=0
We move all terms containing X to the left, all other terms to the right
0.8X=51
X=51/0.8
X=63+0.59999999999999/0.8
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