[tex](4.2w+7x+5.4)[/tex]
1) Distributing the minus, is the same as distributing "-1". So we can write:
[tex]\begin{gathered} -(-4.2w-7x-5.4)\text{ =-1}(-4.2w-7x-5.4) \\ \end{gathered}[/tex]
2) A -1, swaps the sign of all terms within the parentheses:
[tex](4.2w+7x+5.4)[/tex]
3) Hence this is the answer (above).
