-20-(4-1-1)=-15

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Solution for -20-(4-1-1)=-15 equation: 


Simplifying
-20 + -1(4 + -1 + -1) = -15

Combine like terms: 4 + -1 = 3
-20 + -1(3 + -1) = -15

Combine like terms: 3 + -1 = 2
-20 + -1(2) = -15

Multiply -1 * 2
-20 + -2 = -15

Combine like terms: -20 + -2 = -22
-22 = -15

Solving
-22 = -15

Couldn't find a variable to solve for.

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

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