3(3)+7(-4)=-1

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Solution for 3(3)+7(-4)=-1 equation: 


Simplifying
3(3) + 7(-4) = -1

Multiply 3 * 3
9 + 7(-4) = -1

Multiply 7 * -4
9 + -28 = -1

Combine like terms: 9 + -28 = -19
-19 = -1

Solving
-19 = -1

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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