1800 / (1+x)^1 + 1800 / (1+x)^2 + 6000 / (1+x)^3 + 4800/(1+x)^4 - 8000 = 01800 / (1+x)^1 + 1800 / (1+x)^2 + 6000 / (1+x)^3 + 4800/(1+x)^4 - 8000 = 0

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