-3(2+4)=-3()+(-3)(4)

Solution for -3(2+4)=-3()+(-3)(4) equation:

-3(2+4)=-3()+(-3)(4)

We simplify the equation to the form, which is simple to understand 
-3(2+4)=-3()+(-3)*(4)

Reorder the terms in parentheses
+(-18)=-3*()+(-3)*(4)

Remove unnecessary parentheses
-18=-3+*(+)+(-3+)+*(+4+)

Reorder the terms in parentheses
-18=+()+(-3)*(4)

Remove unnecessary parentheses
-18=+(-3+)+*(+4+)

Reorder the terms in parentheses
multiplication of parentheses
-18=+(-12)



Remove unnecessary parentheses
-18=-12

We move all terms containing  to the left and all other terms to the right. 
0=-12+18

We simplify left and right side of the equation. 
0=+6

0=6

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