Question 154234
Once you put a number inside the absolute value sign, it is made 
positive no matter what it's sign is
{{{abs(a) + a + abs(-2a) + abs(-a)}}}
{{{abs(a) + a + abs(-2a) + abs(-a) = a + a + 2a + a}}}
{{{a + a + 2a + a = 5a}}} answer