x=1
Do 3 times x and three times one and get 3x+3
now on the right side multiply -2 by (x-1) and negative times negative is positive so you have -2x+-2x+6 = 3x+3
now subtract 2x on both sides and get
-2+6=x+3
now -2+6 =4 so 4 =x+3
now we do 4-3=1 so
x=1