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x in (-oo:+oo)
-2/7 = (-5/2)*x-(8/3) // - (-5/2)*x-(8/3)
8/3-((-5/2)*x)-2/7 = 0
(5/2)*x-2/7+8/3 = 0
5/2*x+50/21 = 0 // - 50/21
5/2*x = -50/21 // : 5/2
x = -50/21/5/2
x = -20/21
x = -20/21
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