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x in (-oo:+oo)
(-2/7)*x < 12/25 // - 12/25
(-2/7)*x-(12/25) < 0
(-2/7)*x-12/25 < 0
-2/7*x-12/25 < 0 // + 12/25
-2/7*x < 12/25 // : -2/7
x > 12/25/(-2/7)
x > -42/25
x in (-42/25:+oo)
(-42/25:+oo)
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