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x in (-oo:+oo)
x/3 > -7 // + 7
x/3+7 > 0
1/3*x+7 > 0 // - 7
1/3*x > -7 // : 1/3
x > -7/1/3
x > -21
x in (-21:+oo)
(-21:+oo)
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