difference of the arithmetical sequence problem Choose the first element and the difference of the arithmetical sequence, where you know that $$a_3+a_5+a_7=-12, a_3*a_4*a_5=-90$$ Choose the first element and the difference

With $$a_3=a_1+2d,a_4=a_1+3d,a_5=a_1+4d,a_7=a_1+6d$$ we get the system $$3a_1+12d=-12$$ and

$$(a_1+2d)(a_1+3d)(a_1+4d)=-90$$ Can you solve this=