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+1.5P+6+21+2P-9=105
We move all terms to the left:
+1.5P+6+21+2P-9-(105)=0
We add all the numbers together, and all the variables
3.5P-87=0
We move all terms containing P to the left, all other terms to the right
3.5P=87
P=87/3.5
P=24+1/1.1666666666667
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