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