3[4-(21)]=

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Solution for 3[4-(21)]= equation: 


Simplifying
3[4 + -1(21)] = 0

Multiply -1 * 21
3[4 + -21] = 0

Combine like terms: 4 + -21 = -17
3[-17] = 0

Multiply 3 * -17
-51 = 0

Solving
-51 = 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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