(21/7)-2(-3)=

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Solution for (21/7)-2(-3)= equation:


(21/7)-2(-3)=0

We simplify the equation to the form, which is simple to understand 
(21/7)-2(-3)=0

Simplifying:
(+3)-2*(-3)=0

Remove unnecessary parentheses
+3-2*(-3)=0

Reorder the terms in parentheses
+3+(+6)=0

Remove unnecessary parentheses
+3+6=0

We move all terms containing  to the left and all other terms to the right. 
0=0-3-6

We simplify left and right side of the equation. 
0=-9

0=-9

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

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