18+21.30-(-15)=

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Solution for 18+21.30-(-15)= equation:


18+21.30-(-15)=0

We simplify the equation to the form, which is simple to understand 
18+21.30-(-15)=0

Remove unnecessary parentheses
18+21.30+15=0

We move all terms containing  to the left and all other terms to the right. 
0=0-18-21.3-15

We simplify left and right side of the equation. 
0=-54.3

0=-54.3

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

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