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20-((2*x)/5) = 16 // - 16
20-((2*x)/5)-16 = 0
(-2/5)*x-16+20 = 0
4-2/5*x = 0 // - 4
-2/5*x = -4 // : -2/5
x = -4/(-2/5)
x = 10
x = 10
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