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x in (-oo:+oo)
(1/4)*(8*x-4) = 9 // - 9
(1/4)*(8*x-4)-9 = 0
1/4*(8*x-4)-9 = 0
1/4*(8*x-4)-9 = 0
2*x-10 = 0
2*x-10 = 0
2*x-10 = 0 // + 10
2*x = 10 // : 2
x = 10/2
x = 5
x = 5
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