Looking at a past exam and a question has me stumped...

Given that x and y are both variables of type in, the statemennts:

y = x + x;

y += y+y;

are equivilent to

a) y= 2 * x;

b) y = 4 * x;

c) y = 6 * x;

d) y = 8 * x;

i have no idea how this works out.. all i can guess is A because there is 2 x's

if somoene could help and explain how this works it would be appreciated.

thanks