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20 = (4/5)*x // - (4/5)*x
20-((4/5)*x) = 0
(-4/5)*x+20 = 0
20-4/5*x = 0 // - 20
-4/5*x = -20 // : -4/5
x = -20/(-4/5)
x = 25
x = 25
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