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x in (-oo:+oo)
8*x-(8/4) = 18 // - 18
8*x-(8/4)-18 = 0
8*x-18-2 = 0
8*x-20 = 0 // + 20
8*x = 20 // : 8
x = 20/8
x = 5/2
x = 5/2
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