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404.54 = x/1.631 // - x/1.631
404.54-(x/1.631) = 0
404.54-0.61312078*x = 0
404.54-0.61312078*x = 0 // - 404.54
-0.61312078*x = -404.54 // : -0.61312078
x = -404.54/(-0.61312078)
x = 659.80474516
x = 659.80474516
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