Question 199086
Use  order  of  operations,  PEMDAS
.
7[  2x - 4 -2(x+1)] =7x +3
.
7[ 2x -4 -2x -2)] = 7x + 3
.
7[ -6] = 7x + 3
.
-42 -3 =-45 =7x
.
-45 / 7 = x
.
check  by  subst  into  original  eqn,,,,ok