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g in (-oo:+oo)
(-3/4)*g < 21 // - 21
(-3/4)*g-21 < 0
-3/4*g-21 < 0 // + 21
-3/4*g < 21 // : -3/4
g > 21/(-3/4)
g > -28
g in (-28:+oo)
(-28:+oo)
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