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x in (-oo:+oo)
3/8-(x/4) = 12 // - 12
3/8-(x/4)-12 = 0
-1/4*x-93/8 = 0 // + 93/8
-1/4*x = 93/8 // : -1/4
x = 93/8/(-1/4)
x = -93/2
x = -93/2
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