-3(2-y)=21

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Solution for -3(2-y)=21 equation: 


Simplifying
-3(2 + -1y) = 21
(2 * -3 + -1y * -3) = 21
(-6 + 3y) = 21

Solving
-6 + 3y = 21

Solving for variable 'y'.

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

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

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

Combine like terms: 21 + 6 = 27
3y = 27

Divide each side by '3'.
y = 9

Simplifying
y = 9

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