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x in (-oo:+oo)
(7*x)/8-4 = x/2+17 // - x/2+17
(7*x)/8-(x/2)-17-4 = 0
3/8*x-21 = 0 // + 21
3/8*x = 21 // : 3/8
x = 21/3/8
x = 56
x = 56
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