-21=3-4*0

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Solution for -21=3-4*0 equation: 


Simplifying
-21 = 3 + -4 * 0

Multiply -4 * 0
-21 = 3 + 0

Anything times zero is zero.
-21 = 3 + 0

Combine like terms: 3 + 0 = 3
-21 = 3

Solving
-21 = 3

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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