7y-4y=21

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Solution for 7y-4y=21 equation: 


Simplifying
7y + -4y = 21

Combine like terms: 7y + -4y = 3y
3y = 21

Solving
3y = 21

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Divide each side by '3'.
y = 7

Simplifying
y = 7

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