Solve the matrix equation 2 upper x minus upper a equals upper b2x−a=b for x. let upper a equals left bracket start 2 by 3 matrix 1st row 1st column 5 2nd column 9 3rd column negative 7 2nd row 1st column 4 2nd column negative 3 3rd column 1 endmatrix right bracketa= 5 9 −7 4 −3 1 and upper b equals left bracket start 2 by 3 matrix 1st row 1st column negative 2 2nd column 1 3rd column 0 2nd row 1st column 4 2nd column 6 3rd column 3 endmatrix right bracketb= −2 1 0 4 6 3 .