5y-5(4.2+y)=21

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Solution for 5y-5(4.2+y)=21 equation: 


Simplifying
5y + -5(4.2 + y) = 21
5y + (4.2 * -5 + y * -5) = 21
5y + (-21 + -5y) = 21

Reorder the terms:
-21 + 5y + -5y = 21

Combine like terms: 5y + -5y = 0
-21 + 0 = 21
-21 = 21

Solving
-21 = 21

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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