-21+3y=15

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Solution for -21+3y=15 equation: 


Simplifying
-21 + 3y = 15

Solving
-21 + 3y = 15

Solving for variable 'y'.

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

Add '21' to each side of the equation.
-21 + 21 + 3y = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 3y = 15 + 21
3y = 15 + 21

Combine like terms: 15 + 21 = 36
3y = 36

Divide each side by '3'.
y = 12

Simplifying
y = 12

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