9-4[(2-9)-(-7-9)]=

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Solution for 9-4[(2-9)-(-7-9)]= equation: 


Simplifying
9 + -4[(2 + -9) + -1(-7 + -9)] = 0

Combine like terms: 2 + -9 = -7
9 + -4[(-7) + -1(-7 + -9)] = 0
9 + -4[-7 + -1(-7 + -9)] = 0

Combine like terms: -7 + -9 = -16
9 + -4[-7 + -1(-16)] = 0

Multiply -1 * -16
9 + -4[-7 + 16] = 0

Combine like terms: -7 + 16 = 9
9 + -4[9] = 0

Multiply -4 * 9
9 + -36 = 0

Combine like terms: 9 + -36 = -27
-27 = 0

Solving
-27 = 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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