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X-0.55X=87
We move all terms to the left:
X-0.55X-(87)=0
We add all the numbers together, and all the variables
0.45X-87=0
We move all terms containing X to the left, all other terms to the right
0.45X=87
X=87/0.45
X=193+0.14999999999999/0.45
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