3y-21+4y=15-2y

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Solution for 3y-21+4y=15-2y equation:


Simplifying
3y + -21 + 4y = 15 + -2y

Reorder the terms:
-21 + 3y + 4y = 15 + -2y

Combine like terms: 3y + 4y = 7y
-21 + 7y = 15 + -2y

Solving
-21 + 7y = 15 + -2y

Solving for variable 'y'.

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

Add '2y' to each side of the equation.
-21 + 7y + 2y = 15 + -2y + 2y

Combine like terms: 7y + 2y = 9y
-21 + 9y = 15 + -2y + 2y

Combine like terms: -2y + 2y = 0
-21 + 9y = 15 + 0
-21 + 9y = 15

Add '21' to each side of the equation.
-21 + 21 + 9y = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 9y = 15 + 21
9y = 15 + 21

Combine like terms: 15 + 21 = 36
9y = 36

Divide each side by '9'.
y = 4

Simplifying
y = 4

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