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x in (-oo:+oo)
3/8-((1/2)*x) = 3 // - 3
3/8-((1/2)*x)-3 = 0
(-1/2)*x+3/8-3 = 0
-1/2*x-21/8 = 0 // + 21/8
-1/2*x = 21/8 // : -1/2
x = 21/8/(-1/2)
x = -21/4
x = -21/4
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