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x in (-oo:+oo)
(7*x)/8 = 1/2 // - 1/2
(7*x)/8-(1/2) = 0
(7*x)/8-1/2 = 0
7/8*x-1/2 = 0 // + 1/2
7/8*x = 1/2 // : 7/8
x = 1/2/7/8
x = 4/7
x = 4/7
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