How do you work these out with explanation please x

Answer:
a) Multiply 2 with the terms in the brackets;
2x + 6 = x - 4
Like previously, move all x terms to one side of the equation;
2x - x = -4 -6
x = -10
b) Multiply 2 with the terms in the brackets;
20x - 8 = 18x + 6
Move all x terms to one side of the equation;
20x - 18x = 6 +8
2x = 14
x = 14/2
x = 7
Hope this helps :)