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8 = 5-((2/5)*x) // - 5-((2/5)*x)
(2/5)*x-5+8 = 0
2/5*x+3 = 0 // - 3
2/5*x = -3 // : 2/5
x = -3/2/5
x = -15/2
x = -15/2
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