3x+4=-5x-3+15 First combine like terms: 3x+4=-5x+12 Get x on one side: 3x+4=-5x+12 -3x -3x 4=-8x+12 Next get x by itself: 4=8x+12 -12 -12 -8=8x Now divide one more time to get x by itself since 8x is 8 times x and we must do the opposite (÷). -8/8=8x/8 -1=x ---> x=1