Expand the brackets: x + 5 - 8x + 2 = 0
The 8x is obtained from -2 x 4x, and the +2 is obtained from the -2 x -1
Collect all the x's and numbers to give you 7 - 7x = 0
Move the 7x to the right by adding 7x to both sides: 7 = 7x
Divide both sides by 7:
1 = x