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x in (-oo:+oo)
6/7 > -2*x-(8/7) // + -2*x-(8/7)
6/7-(-2*x)+8/7 > 0
2*x+6/7+8/7 > 0
2*x+2 > 0 // - 2
2*x > -2 // : 2
x > -2/2
x > -1
x in (-1:+oo)
(-1:+oo)
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