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20-((4/5)*x) = 16 // - 16
20-((4/5)*x)-16 = 0
(-4/5)*x-16+20 = 0
4-4/5*x = 0 // - 4
-4/5*x = -4 // : -4/5
x = -4/(-4/5)
x = 5
x = 5
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