Question 665667
What are you solving for?
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Starting with
{{{Y = (p+q+r)/5}}}
Multiply both sides by 5 to be rid of the fraction
{{{5Y = ((p+q+r)/cross(5))(cross(5))}}}
5Y = p+q+r
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p = 5Y - q - r
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q = 5Y - p - r
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r = 5Y - p - q
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