Answer:
10y-7=0
Explanation:
5y-7+y= -(y+3y)
first you distribute the -1 into the parenthesis
5y-7+y = -y-3y
then you have to get y on a side by itself. start by adding +y to both sides. This cancels out the -y on the left side leaving you with:
6y-7+y=-3y
next you add +3y to both sides, canceling out the -3y on the left and leaving you with:
9y-7+y=0
combine the +y and 9y and your answer is:
10y-7=0