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c = (sqrt(r/t))-2
bring the 2 to the other side:
c + 2 = sqrt(r/t)
square both sides to get rid of the square root:
(c+2)^2 = r/t
multiply both sides by (t^2)/r to get rid of the fraction of r/t:
((c+2)^2)times (t^2)/r = t
if we expand the equation, we get:
(c^2 + 4c +4)x (t^2)/r = t
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