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x in (-oo:+oo)
8*x-(18/3) = 12 // - 12
8*x-(18/3)-12 = 0
8*x-12-6 = 0
8*x-18 = 0 // + 18
8*x = 18 // : 8
x = 18/8
x = 9/4
x = 9/4
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