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x in (-oo:+oo)
(2*x)/4-6 = 2.5 // - 2.5
(2*x)/4-6-2.5 = 0
1/2*x-8.5 = 0 // + 8.5
1/2*x = 8.5 // : 1/2
x = 8.5/1/2
x = 17
x = 17
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