4-9=2(2+1)

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Solution for 4-9=2(2+1) equation: 


Simplifying
4 + -9 = 2(2 + 1)

Combine like terms: 4 + -9 = -5
-5 = 2(2 + 1)

Combine like terms: 2 + 1 = 3
-5 = 2(3)

Multiply 2 * 3
-5 = 6

Solving
-5 = 6

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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