-10-(-21)+(-5)-15=

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Solution for -10-(-21)+(-5)-15= equation:


-10-(-21)+(-5)-15=0

We simplify the equation to the form, which is simple to understand 
-10-(-21)+(-5)-15=0

Remove unnecessary parentheses
-10+21+(-5)-15=0

Remove unnecessary parentheses
-10+21-5-15=0

We move all terms containing  to the left and all other terms to the right. 
0=0+10-21+5+15

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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