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x in (-oo:+oo)
21/16 = (6*x)/16 // - (6*x)/16
21/16-((6*x)/16) = 0
(-3/8)*x+21/16 = 0
21/16-3/8*x = 0 // - 21/16
-3/8*x = -21/16 // : -3/8
x = -21/16/(-3/8)
x = 7/2
x = 7/2
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