-3 < р < 12
-3 < р < 12 | ×(-4)
-3×(-4) > -4p > 12×(-4)
12 > -4p > -48
12 > -4p > -48 | -3
12-3 > -4p-3 > -48-3
9 > -4p-3 > -51
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-3 < р < 12
-3 < р < 12 | ×(-4)
-3×(-4) > -4p > 12×(-4)
12 > -4p > -48
12 > -4p > -48 | -3
12-3 > -4p-3 > -48-3
9 > -4p-3 > -51