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x in (-oo:+oo)
8-((1/4)*x) = 20 // - 20
8-((1/4)*x)-20 = 0
(-1/4)*x-20+8 = 0
-1/4*x-12 = 0 // + 12
-1/4*x = 12 // : -1/4
x = 12/(-1/4)
x = -48
x = -48
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