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0.09p+0.01(8000-p)=840
We move all terms to the left:
0.09p+0.01(8000-p)-(840)=0
We add all the numbers together, and all the variables
0.09p+0.01(-1p+8000)-840=0
We multiply parentheses
0.09p-0.01p+80-840=0
We add all the numbers together, and all the variables
0.08p-760=0
We move all terms containing p to the left, all other terms to the right
0.08p=760
p=760/0.08
p=9500
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