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