4+7-20=

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Solution for 4+7-20= equation:


4+7-20=0

We simplify the equation to the form, which is simple to understand 
4+7-20=0

We move all terms containing  to the left and all other terms to the right. 
0=0-4-7+20

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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