3-(3+5)-(6+8)=

Solution for 3-(3+5)-(6+8)= equation:

3-(3+5)-(6+8)=0

We simplify the equation to the form, which is simple to understand 
3-(3+5)-(6+8)=0

Simplifying terms in parentheses
3-(+8)-(6+8)=0

Simplifying terms in parentheses
3-(+8)-(+14)=0

Remove unnecessary parentheses
3-8-(+14)=0

Remove unnecessary parentheses
3-8-14=0

We move all terms containing  to the left and all other terms to the right. 
0=0-3+8+14

We simplify left and right side of the equation. 
0=+19

0=19

The left and right sides are not equal, therefore there is no solution. This equation is invalid.