3-6y=-21

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Solution for 3-6y=-21 equation: 


Simplifying
3 + -6y = -21

Solving
3 + -6y = -21

Solving for variable 'y'.

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

Add '-3' to each side of the equation.
3 + -3 + -6y = -21 + -3

Combine like terms: 3 + -3 = 0
0 + -6y = -21 + -3
-6y = -21 + -3

Combine like terms: -21 + -3 = -24
-6y = -24

Divide each side by '-6'.
y = 4

Simplifying
y = 4

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