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x in (-oo:+oo)
(1/2)*(10*x-9) = 4 // - 4
(1/2)*(10*x-9)-4 = 0
1/2*(10*x-9)-4 = 0
1/2*(10*x-9)-4 = 0
5*x-17/2 = 0
5*x-17/2 = 0
5*x-17/2 = 0 // + 17/2
5*x = 17/2 // : 5
x = 17/2/5
x = 17/10
x = 17/10
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