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13 - ((6.67 * 10^-11 * x * 65))/((1+1)^2) = 65 * (2*3.14^2) / 3600
13 - ((6.67 * 10^-11 * x * 65))/((1+1)^2) = 65 * (2*3.14^2) / 3600
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