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(1/2)*(5*x-9) = 4 // - 4
(1/2)*(5*x-9)-4 = 0
1/2*(5*x-9)-4 = 0
1/2*(5*x-9)-4 = 0
5/2*x-17/2 = 0
5/2*x-17/2 = 0
5/2*x-17/2 = 0 // + 17/2
5/2*x = 17/2 // : 5/2
x = 17/2/5/2
x = 17/5
x = 17/5
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