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The distance from the point P(x,y) to the line ax+by+c=0 is:
Difficulty: Easy
A: 
$\frac{a+b+c}{\sqrt{x^{2}+y^{2}}}$
B: 
$\frac{x+y+c}{\sqrt{x^{2}+y^{2}}}$
C: 
$\frac{ax+by+c}{\sqrt{a^{2}+b^{2}}}$
D: 
$\frac{(a+b+c)}{\sqrt{a^{2}+b^{2}}}$
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