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4/5 = 9-((1/2)*x) // - 9-((1/2)*x)
(1/2)*x+4/5-9 = 0
1/2*x-41/5 = 0 // + 41/5
1/2*x = 41/5 // : 1/2
x = 41/5/1/2
x = 82/5
x = 82/5
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