(1,2а-4)+(40-4,8а)

To simplify the expression \((1,2a - 4) + (40 - 4.8a)\), let's first rewrite it clearly:

\[ (1.2a - 4) + (40 - 4.8a) \]

Now, combine like terms:

1. Combine the \(a\) terms: \(1.2a - 4.8a = -3.6a\)
2. Combine the constant terms: \(-4 + 40 = 36\)

Putting it all together, we have:

\[ -3.6a + 36 \]

So, the simplified form of the expression is:

\[ 36 - 3.6a \]