решите двойное неравенство 1) 3<7-4х<15 2) -12<2(х+3)<4
7-4x>3; 4x<4; x<1;
7-4x<15; 4x>-8; x>-2;
Ответ: -2<x<1
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7-4x>3; 4x<4; x<1;
7-4x<15; 4x>-8; x>-2;
Ответ: -2<x<1