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71/40 = 13/10-((1/2)*x) // - 13/10-((1/2)*x)
(1/2)*x+71/40-(13/10) = 0
(1/2)*x+71/40-13/10 = 0
1/2*x+19/40 = 0 // - 19/40
1/2*x = -19/40 // : 1/2
x = -19/40/1/2
x = -19/20
x = -19/20
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