6+0.5(2+1)=

Solution for 6+0.5(2+1)= equation:

6 + 0.5(2+1)=0

We simplify the equation to the form, which is simple to understand 
6 + 0.5(2+1)=0

Simplifying terms in parentheses
6 + 0.5*(+3)=0

Reorder the terms in parentheses
6+(+1.5)=0

Remove unnecessary parentheses
+6+1.5=0

We move all terms containing  to the left and all other terms to the right. 
0=0-6-1.5

We simplify left and right side of the equation. 
0=-7.5

0=-7.5

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