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18-((4/5)*x) = 13 // - 13
18-((4/5)*x)-13 = 0
(-4/5)*x-13+18 = 0
5-4/5*x = 0 // - 5
-4/5*x = -5 // : -4/5
x = -5/(-4/5)
x = 25/4
x = 25/4
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