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(1/2)*(5*x-9) = 8 // - 8
(1/2)*(5*x-9)-8 = 0
1/2*(5*x-9)-8 = 0
1/2*(5*x-9)-8 = 0
5/2*x-25/2 = 0
5/2*x-25/2 = 0
5/2*x-25/2 = 0 // + 25/2
5/2*x = 25/2 // : 5/2
x = 25/2/5/2
x = 5
x = 5
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