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x in (-oo:+oo)
(1/8)*x = 1550 // - 1550
(1/8)*x-1550 = 0
1/8*x-1550 = 0 // + 1550
1/8*x = 1550 // : 1/8
x = 1550/1/8
x = 12400
x = 12400
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