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20-((3/5)*x) = 5 // - 5
20-((3/5)*x)-5 = 0
(-3/5)*x-5+20 = 0
15-3/5*x = 0 // - 15
-3/5*x = -15 // : -3/5
x = -15/(-3/5)
x = 25
x = 25
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