21=3(3-9)

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Solution for 21=3(3-9) equation: 


Simplifying
21 = 3(3 + -9)

Combine like terms: 3 + -9 = -6
21 = 3(-6)

Multiply 3 * -6
21 = -18

Solving
21 = -18

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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