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16/5 = x/2.5 // - x/2.5
16/5-(x/2.5) = 0
16/5-0.4*x = 0
16/5-0.4*x = 0 // - 16/5
-0.4*x = -16/5 // : -0.4
x = -16/5/(-0.4)
x = 8
x = 8
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