Given: p: 3x 7 = –5 q: 4x 12 = –4 which is the contrapositive of p → q? if 3x 7 = −5, then 4x 12 = –4. if 4x 12 = –4, then 3x 7 = −5. if 3x 7 ≠ −5, then 4x 12 ≠ –4. if 4x 12 ≠ –4, then 3x 7 ≠ −5.