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15/123.75 = x/478.5 // - x/478.5
15/123.75-(x/478.5) = 0
15/123.75-0.00208986*x = 0
0.12121212-0.00208986*x = 0 // - 0.12121212
-0.00208986*x = -0.12121212 // : -0.00208986
x = -0.12121212/(-0.00208986)
x = 58.00011484
x = 58.00011484
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