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As stated, there is nothing to rationalise.
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2 peas in a pod
2=p in a q
p = -1
p + (-2) = 1 so p - 2 = 1 Add two to both sides: p = 3
a = L x W: area equals length times the width. p = 2L + 2W: perimeter equals 2 times the length plus 2 times the width so L = (p - 2W)/2