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x in (-oo:+oo)
x = 30/2-(6/8)-(1/2) // - 30/2-(6/8)-(1/2)
x-(30/2)+6/8+1/2 = 0
x+6/8+1/2-15 = 0
x-55/4 = 0 // + 55/4
x = 55/4
x = 55/4
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