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x in (-oo:+oo)
(7-4*x)/2 = 8 // - 8
(7-4*x)/2-8 = 0
(7-4*x)/2+(-8*2)/2 = 0
7-4*x-8*2 = 0
-4*x-9 = 0
(-4*x-9)/2 = 0
(-4*x-9)/2 = 0 // * 2
-4*x-9 = 0
-4*x-9 = 0 // + 9
-4*x = 9 // : -4
x = 9/(-4)
x = -9/4
x = -9/4
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