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13/10-((1/5)*x) = 39/20 // - 39/20
13/10-((1/5)*x)-(39/20) = 0
(-1/5)*x+13/10-39/20 = 0
-1/5*x-13/20 = 0 // + 13/20
-1/5*x = 13/20 // : -1/5
x = 13/20/(-1/5)
x = -13/4
x = -13/4
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