You can put this solution on YOUR website! You would need to apply the "order of operations".
A memory technique used by many is: PEMDAS (Please Excuse My Dear Aunt Sally)
P parentheses first
E exponents
MD mulitplication/division from left to right
AS addition/subtractraction from left to right
.
-3(5-6)-4(2-3)
Handling parentheses first:
-3(-1)-4(-1)
Multiplication left to right:
3-4(-1)
3-(-4)
Rewriting the above we have:
3+4 = 7