3(0)+15=3(0+15)

Solution for 3(0)+15=3(0+15) equation:

3(0)+15=3(0+15)

We simplify the equation to the form, which is simple to understand 
3(0)+15=3(0+15)

Reorder the terms in parentheses
+()+15=3*(0+15)

Remove unnecessary parentheses
+15=+3+*(+15+)

Reorder the terms in parentheses
+15=+(+45)

Remove unnecessary parentheses
+15=0+45

We move all terms containing  to the left and all other terms to the right. 
0=0+45-0-15

We simplify left and right side of the equation. 
0=+30

0=30

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