3(4+-5)=9

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Solution for 3(4+-5)=9 equation: 


Simplifying
3(4 + -5) = 9

Combine like terms: 4 + -5 = -1
3(-1) = 9

Multiply 3 * -1
-3 = 9

Solving
-3 = 9

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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