21x-3(7x+4)=12

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Solution for 21x-3(7x+4)=12 equation: 


Simplifying
21x + -3(7x + 4) = 12

Reorder the terms:
21x + -3(4 + 7x) = 12
21x + (4 * -3 + 7x * -3) = 12
21x + (-12 + -21x) = 12

Reorder the terms:
-12 + 21x + -21x = 12

Combine like terms: 21x + -21x = 0
-12 + 0 = 12
-12 = 12

Solving
-12 = 12

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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