2 x b = 2b and 2 x 4 = 8. The new expression is 6 = 2b - 8 + 2. -8 + 2 = 6. 6 = 2b - 6. Move the variable to the lest-hand side and change its sign. -2b + 6 = -6. -6 - 6 is the same as -6 + -6 and that equals -12. -2b = -12. Now divide both sides of the equation by -2 to get b = 6.
