12×(1 3/4x+5/8)=-6 1/2

(1 3/4x+5/8)= -6 1/2:121 3/4x+5/8= -13/2×1/127/4x= -13/24-5/87/4x= -13/24-15/24x= -7/6×4/7x= -2/3