7y+6=21+4y

Solution for 7y+6=21+4y equation:

Simplifying
7y + 6 = 21 + 4y

Reorder the terms:
6 + 7y = 21 + 4y

Solving
6 + 7y = 21 + 4y

Solving for variable 'y'.

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

Add '-4y' to each side of the equation.
6 + 7y + -4y = 21 + 4y + -4y

Combine like terms: 7y + -4y = 3y
6 + 3y = 21 + 4y + -4y

Combine like terms: 4y + -4y = 0
6 + 3y = 21 + 0
6 + 3y = 21

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 = 15
3y = 15

Divide each side by '3'.
y = 5

Simplifying
y = 5