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15-((1/5)*x) = 5 // - 5
15-((1/5)*x)-5 = 0
(-1/5)*x-5+15 = 0
10-1/5*x = 0 // - 10
-1/5*x = -10 // : -1/5
x = -10/(-1/5)
x = 50
x = 50
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