Simplify 3x-(7x+3y): Distributing Negative Signs in Algebraic Expressions

First, we open the parentheses and change the sign accordingly.

Since there are only positive numbers within the parentheses, multiplying by the minus will give us negative numbers:

$3x-7x-3y=$

Now we group the X factors:

$3x-7x=-4x$

Now we obtain:

$-4x-3y$