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minimise (1+3r)^3 + (1+3r)(1+3r) + (1+3r)^2(1+3r)^2 -3(1+3r)
minimise (1+3r)^3 + (1+3r)(1+3r) + (1+3r)^2(1+3r)^2 -3(1+3r)
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