21/2-2/5=

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Solution for 21/2-2/5= equation:


21/2-2/5=0

We simplify the equation to the form, which is simple to understand 
21/2-2/5=0

Simplifying:
+10.5-2/5=0

Simplifying:
+10.5-0.4=0

We move all terms containing  to the left and all other terms to the right. 
0=0-10.5 + 0.4

We simplify left and right side of the equation. 
0=-10.1

0=-10.1

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

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