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Find the centroid, incentre circum-centre and orthocentre of the triangle whosesie the equations `3x-4y=0, 12 y + 5 x = 0 and y-15=0`

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The equation of the sides of the traingle are:
`3x-4y=0`
`12y+5x=0`
`y-15=0`
...
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