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(0.395*0.8)/250 = (0.789474*x)/500 // - (0.789474*x)/500
(0.395*0.8)/250-((0.789474*x)/500) = 0
(0.395*0.8)/250-0.00157895*x = 0
0.001264-0.00157895*x = 0 // - 0.001264
-0.00157895*x = -0.001264 // : -0.00157895
x = -0.001264/(-0.00157895)
x = 0.800532
x = 0.800532
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