You can put this solution on YOUR website! 7a-(a-5)=-10
Distribute the negative sign to terms inside the parenthesis:
7a-a+5 = -10
Combine a's:
6a+5 = -10
Subtract 5 from both sides:
6a = -15
Finally, divide both sides by 6
a = -15/6
Reduce:
a = -5/2