12-(-9)-[5-(4)]=

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Solution for 12-(-9)-[5-(4)]= equation:


Simplifying
12 + -1(-9) + -1[5 + -1(4)] = 0

Multiply -1 * -9
12 + 9 + -1[5 + -1(4)] = 0

Multiply -1 * 4
12 + 9 + -1[5 + -4] = 0

Combine like terms: 5 + -4 = 1
12 + 9 + -1[1] = 0

Multiply -1 * 1
12 + 9 + -1 = 0

Combine like terms: 12 + 9 = 21
21 + -1 = 0

Combine like terms: 21 + -1 = 20
20 = 0

Solving
20 = 0

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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