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19/40 = x/3.6 // - x/3.6
19/40-(x/3.6) = 0
19/40-0.27777778*x = 0
19/40-0.27777778*x = 0 // - 19/40
-0.27777778*x = -19/40 // : -0.27777778
x = -19/40/(-0.27777778)
x = 1.70999999
x = 1.70999999
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