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

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

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

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

Reorder the terms in parentheses
+(-18)=-3*(2)+(-3)*(4)

Remove unnecessary parentheses
-18=-3+*(+2+)+(-3+)+*(+4+)

Reorder the terms in parentheses
-18=+(-6)+(-3)*(4)

Remove unnecessary parentheses
-18=-6+(-3+)+*(+4+)

Reorder the terms in parentheses
multiplication of parentheses
-18=-6+(-12)



Remove unnecessary parentheses
-18=-6-12

We move all terms containing  to the left and all other terms to the right. 
0=-6-12+18

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

0=0

This equation is an identity, so all real numbers are solutions.