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9-((1/5)*x) = 1/10 // - 1/10
9-((1/5)*x)-(1/10) = 0
(-1/5)*x-1/10+9 = 0
89/10-1/5*x = 0 // - 89/10
-1/5*x = -89/10 // : -1/5
x = -89/10/(-1/5)
x = 89/2
x = 89/2
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