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25-((2/5)*x) = 5 // - 5
25-((2/5)*x)-5 = 0
(-2/5)*x-5+25 = 0
20-2/5*x = 0 // - 20
-2/5*x = -20 // : -2/5
x = -20/(-2/5)
x = 50
x = 50
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