3y+(y+5)=21

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Solution for 3y+(y+5)=21 equation:


Simplifying
3y + (y + 5) = 21

Reorder the terms:
3y + (5 + y) = 21

Remove parenthesis around (5 + y)
3y + 5 + y = 21

Reorder the terms:
5 + 3y + y = 21

Combine like terms: 3y + y = 4y
5 + 4y = 21

Solving
5 + 4y = 21

Solving for variable 'y'.

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

Add '-5' to each side of the equation.
5 + -5 + 4y = 21 + -5

Combine like terms: 5 + -5 = 0
0 + 4y = 21 + -5
4y = 21 + -5

Combine like terms: 21 + -5 = 16
4y = 16

Divide each side by '4'.
y = 4

Simplifying
y = 4

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