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(1/2)*(10*x-9) = 8 // - 8
(1/2)*(10*x-9)-8 = 0
1/2*(10*x-9)-8 = 0
1/2*(10*x-9)-8 = 0
5*x-25/2 = 0
5*x-25/2 = 0
5*x-25/2 = 0 // + 25/2
5*x = 25/2 // : 5
x = 25/2/5
x = 5/2
x = 5/2
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