[tex]\displaystyle\bf\\a_{1}=-12\\\\a_{4} =3\\\\\\a_{4} =a_{1} +3d\\\\3d=a_{4} - a_{1} =3-(-12)=3+12=15\\\\d=15:3=5\\\\a_{2}=a_{1} +d=-12+5=-7\\\\a_{3} =a_{2} +d=-7+5=-2\\\\\\Otvet \ : \ -12 \ ; \ \boxed{ -7 \ ; \ -2} \ ; \ 3[/tex]
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[tex]\displaystyle\bf\\a_{1}=-12\\\\a_{4} =3\\\\\\a_{4} =a_{1} +3d\\\\3d=a_{4} - a_{1} =3-(-12)=3+12=15\\\\d=15:3=5\\\\a_{2}=a_{1} +d=-12+5=-7\\\\a_{3} =a_{2} +d=-7+5=-2\\\\\\Otvet \ : \ -12 \ ; \ \boxed{ -7 \ ; \ -2} \ ; \ 3[/tex]