3Y=21-4Y

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Solution for 3Y=21-4Y equation: 


Simplifying
3Y = 21 + -4Y

Solving
3Y = 21 + -4Y

Solving for variable 'Y'.

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

Add '4Y' to each side of the equation.
3Y + 4Y = 21 + -4Y + 4Y

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

Combine like terms: -4Y + 4Y = 0
7Y = 21 + 0
7Y = 21

Divide each side by '7'.
Y = 3

Simplifying
Y = 3

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