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x in (-oo:+oo)
3/8-(x/2) = (3*x)/8+13/2 // - (3*x)/8+13/2
3/8-(x/2)-((3*x)/8)-(13/2) = 0
(-3/8)*x-(x/2)+3/8-13/2 = 0
-7/8*x-49/8 = 0 // + 49/8
-7/8*x = 49/8 // : -7/8
x = 49/8/(-7/8)
x = -7
x = -7
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