3(4+y)=21

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Solution for 3(4+y)=21 equation: 


Simplifying
3(4 + y) = 21
(4 * 3 + y * 3) = 21
(12 + 3y) = 21

Solving
12 + 3y = 21

Solving for variable 'y'.

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

Add '-12' to each side of the equation.
12 + -12 + 3y = 21 + -12

Combine like terms: 12 + -12 = 0
0 + 3y = 21 + -12
3y = 21 + -12

Combine like terms: 21 + -12 = 9
3y = 9

Divide each side by '3'.
y = 3

Simplifying
y = 3

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