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x in (-oo:+oo)
(2/3)*x-13 < -7/6 // + -7/6
(2/3)*x-(-7/6)-13 < 0
(2/3)*x+7/6-13 < 0
2/3*x-71/6 < 0 // + 71/6
2/3*x < 71/6 // : 2/3
x < 71/6/2/3
x < 71/4
x in (-oo:71/4)
(-oo:71/4)
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